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We are pleased to present this year's Annual Water Quality Report (Consumer Confidence Report) as required by the Safe Drinking Water Act (SDWA). This report is designed to provide details about where your water comes from, what it contains, and how it compares to standards set by regulatory agencies. This report is a snapshot of last year's water quality. We are committed to providing you with information because informed customers are our best allies.
Do I need to take special precautions?
Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Water Drinking Hotline (800-426-4791).
Where does my water come from?
Fishing Bridge Well #1 and Well #2, Lake Village Springs
Source water assessment and its availability
June 2004 available upon request.
Why are there contaminants in my drinking water?
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency's (EPA) Safe Drinking Water Hotline (800-426-4791). The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity: microbial contaminants, such as viruses and bacteria, that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife; inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban stormwater runoff, industrial, or domestic wastewater discharges, oil and gas production, mining, or farming; pesticides and herbicides, which may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses; organic Chemical Contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, and septic systems; and radioactive contaminants, which can be naturally occurring or be the result of oil and gas production and mining activities. In order to ensure that tap water is safe to drink, EPA prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. Food and Drug Administration (FDA) regulations establish limits for contaminants in bottled water which must provide the same protection for public health.
How can I get involved?
Please Contact Steven Hoffman steven_hoffman@nps.gov 307-254-7565 if you have any questions.
Description of water treatment process
Your water is treated by disinfection. Disinfection involves the addition of chlorine or other disinfectant to kill dangerous bacteria and microorganisms that may be in the water. Disinfection is considered to be one of the major public health advances of the 20th century.
Water conservation tips
Did you know that the average U.S. household uses approximately 400 gallons of water per day or 100 gallons per person per day? Luckily, there are many low-cost and no-cost ways to conserve water. Small changes can make a big difference - try one today and soon it will become second nature.
Take short showers - a 5 minute shower uses 4 to 5 gallons of water compared to up to 50 gallons for a bath.
Shut off water while brushing your teeth, washing your hair and shaving and save up to 500 gallons a month.
Use a water-efficient showerhead. They're inexpensive, easy to install, and can save you up to 750 gallons a month.
Run your clothes washer and dishwasher only when they are full. You can save up to 1,000 gallons a month.
Water plants only when necessary.
Fix leaky toilets and faucets. Faucet washers are inexpensive and take only a few minutes to replace. To check your toilet for a leak, place a few drops of food coloring in the tank and wait. If it seeps into the toilet bowl without flushing, you have a leak. Fixing it or replacing it with a new, more efficient model can save up to 1,000 gallons a month.
Adjust sprinklers so only your lawn is watered. Apply water only as fast as the soil can absorb it and during the cooler parts of the day to reduce evaporation.
Teach your kids about water conservation to ensure a future generation that uses water wisely. Make it a family effort to reduce next month's water bill!
Protection of drinking water is everyone's responsibility. You can help protect your community's drinking water source in several ways:
Eliminate excess use of lawn and garden fertilizers and pesticides - they contain hazardous chemicals that can reach your drinking water source.
Pick up after your pets.
If you have your own septic system, properly maintain your system to reduce leaching to water sources or consider connecting to a public water system.
Dispose of chemicals properly; take used motor oil to a recycling center.
Volunteer in your community. Find a watershed or wellhead protection organization in your community and volunteer to help. If there are no active groups, consider starting one. Use EPA's Adopt Your Watershed to locate groups in your community, or visit the Watershed Information Network's How to Start a Watershed Team.
Organize a storm drain stenciling project with your local government or water supplier. Stencil a message next to the street drain reminding people "Dump No Waste - Drains to River" or "Protect Your Water." Produce and distribute a flyer for households to remind residents that storm drains dump directly into your local water body.
Significant Deficiencies
Past sanitary surveys identified several significant deficiencies that require follow-up, and we want our community to know that these findings do not mean the water is unsafe. Rather, they highlight areas where our system needs maintenance, updated documentation, or infrastructure improvements. We are already actively addressing these items. With the funds available, we are developing corrective-action plans, drafting proposals, and coordinating with qualified contractors and staff to complete the necessary inspections and repairs. Some items involve straightforward fixes, while others require professional evaluations or specialized materials. In every case, we are committed to resolving these deficiencies as efficiently and responsibly as possible to ensure our system continues to meet all regulatory standards and to provide safe, reliable drinking water.
Open Sanitary Survey Findings:
Survey Year 2025, SD#7: The sanitary surveyor was unable to evaluate the tank air vent and access hatch for Storage Tank ID: ST03 - Lake Village Steel Tank, and the water system was not able to produce documentation of the condition of these components. Each item that could not be inspected during the sanitary survey must be inspected and the structure/condition must be compared to the enclosed Tech Tips for Finished Water Storage Facilities to determine if corrective action is needed. Tank inspectors can be third-party professionals or appropriately trained in-house staff. In order to correct this significant deficiency you must provide EPA with the following documentation:
completed copy of the Unknown Integrity Checklist.
A copy of the inspection report. The inspection report must describe the condition of each specified tank component and include photographs.
The date that any corrective actions needed to address deficiencies with the tank components will be completed. EPA will review the inspection report and may require additional corrective actions.
Determine if wall vents pictured in #ST03-5 go all the way through the tank wall.
Survey Year 2025, SD#20: The tank hatch for Storage Tank ID: ST08 – Fishing Bridge Clearwell must have a neoprene gasket to seal the hatch lid to the frame tightly to prevent contamination (including contamination carried by insects, rodents, and birds) from entering the water system.
Survey Year 2025, SD#19: No drain may be directly connected to a sanitary sewer, combined sewer or storm sewer drain. An air gap must be present such that the drain pipe for Storage Tank ID: ST08 – Fishing Bridge Clearwell terminates at least three pipe diameters above the ground level at the sewer drain, storm drain, splash pad or engineered rip-rap.
Survey Year 2025, SD#18: In order to protect the structural integrity of the tank during changes to tank water levels, and other events affecting the confined air space, Storage Tank ID: ST08 – Fishing Bridge Clearwell must have a vent that is separate from the overflow.
Survey Year 2025, SD#17: In order to protect the integrity of the tank in the case of control system failure leading to overfilling, Storage Tank ID: ST08 – Fishing Bridge Clearwell must have an overflow that is separate from the vent.
Survey Year 2025, SD#15: The tank hatch for Storage Tank ID: ST07 - Lake Village Clearwell must have a neoprene gasket to seal the hatch lid to the frame tightly to prevent contamination (including contamination carried by insects, rodents, and birds) from entering the water system.
Survey Year 2022, SD#9: The valve access vault for the Lake Village Steel Tank (ST03) is filled with water, reportedly from a leaking valve.
Survey Year 2025, SD#14: In order to protect the structural integrity of Storage Tank ID: ST07 - Lake Village Clearwell during changes to tank water levels, and other events affecting the confined air space, the tank must have a vent that is separate from the overflow.
Survey Year 2025, SD#13: The overflow for Storage Tank ID: ST07 - Lake Village Clearwell must discharge over a drainage inlet structure, splash plate, or engineered rip-rap.
Survey Year 2025, SD#12: The overflow on Storage Tank ID: ST07 - Lake Village Clearwell must be fitted with non-corrodible #24-mesh screen, or a properly sealed flapper or duckbill valve to prevent contamination (including contamination carried by insects, rodents, and birds) from entering the water system. The screen should preferably be installed within the pipe at a location least susceptible to vandalism. When a flapper valve is used, a screen must be placed inside the valve (EPA Region 8 recommends non-corrodible #24-mesh screen be used). In cold climates, use of a flapper or duckbill valve should be considered to minimize air movement and hence ice formation in the tank. In cold climates, provisions should be considered to prevent the flapper or duckbill from freezing shut. Correction of this deficiency may require a permit to construct from the WYDEQ and may require an evaluation by an engineering firm to ensure that no damage will occur to the existing water tank as a result of the modifications to address the significant deficiencies.
Survey Year 2025, SD#11: Other than the openings afforded by the #24-mesh screens on the vents and overflows, all openings on Storage Tank ID: ST07 - Lake Village Clearwell must be sealed completely to prevent contamination (including contamination carried by insects, rodents, and birds) from entering the water system. Caulking or sealant must not be used. Penetrations into the tank must be through conduit, bulkhead, or other permanent watertight fittings.
Survey Year 2025, SD#10: The sanitary surveyor was unable to evaluate the tank overflow and drain for Storage Tank ID: ST05 - Fishing Bridge Tank, and the water system was not able to produce documentation of the condition of these components. Each item that could not be inspected during the sanitary survey must be inspected and the structure/condition must be compared to the enclosed Tech Tips for Finished Water Storage Facilities to determine if corrective action is needed. Tank inspectors can be third-party professionals or appropriately trained in-house staff. In order to correct this significant deficiency you must provide EPA with the following documentation:
A completed copy of the Unknown Integrity Checklist.
A copy of the inspection report. The inspection report must describe the condition of each specified tank component and include photographs.
The date that any corrective actions needed to address deficiencies with the tank components will be completed. EPA will review the inspection report and may require additional corrective action
Survey Year 2025, SD#9: Storage Tank ID: ST05 - Fishing Bridge Tank does not appear to be structurally sound. Specifically, the roof of the tank must be evaluated by a professional engineer familiar with the construction of water-storage tanks to determine the integrity of the tank’s roof. Failure to maintain the structural and sanitary integrity of the tank could lead directly to contamination within the tank, illness and/or the loss of property. The professional evaluation of the storage tank must be made as soon as possible and it must be repaired if necessary to ensure the structural integrity and reliability of the tank. An inspection should be performed to ensure the roots of the trees and vegetation growing on top of the tank have not impacted the stability of the tank roof. Trees should be safely removed before they can sustain damage to the tank roof. The divers should evaluate this from the inside of the tank as well.
Survey Year 2025, SD#16: No overflow/drain may be directly connected to a sanitary sewer, combined sewer or storm sewer drain. An air gap must be present on Storage Tank ID: ST07 - Lake Village Clearwell such that the drain pipe terminates at least three pipe diameters above the ground level at the sewer drain, storm drain, splash pad or engineered rip-rap.
Survey Year 2022, SD#1: The system must demonstrate that surface water is not directly entering the groundwater collection structures at the Spring Collection area.
Survey Year 2022, SD#8: The overflow on Tank ID: ST05 - Fishing Bridge II Storage Tank must be piped to an elevation between 12 and 24 inches above the ground surface.
Survey Year 2022, SD#7: The overflow on Tank ID: ST05 - Fishing Bridge II Storage Tank must be fitted with a #24-mesh non-corrodible screen, or a properly sealed flapper or duckbill valve.
Survey Year 2022, SD#6: The air vent on Tank ID: ST03 - Lake Village Steel Tank must be fitted with a #24-mesh non-corrodible screen.
Survey Year 2022, SD#5: The overflow on Tank ID: ST03 - Lake Village Steel Tank, ST04 - Lake Village Concrete Tank must be fitted with a #24-mesh non-corrodible screen, or a properly sealed flapper or duckbill valve.
Survey Year 2022, SD#2: Well ID: WL01 - Fishing Bridge Well #1 must be fitted with a functioning sanitary seal that is tightly bolted and does not allow contamination to enter the well.
Survey Year 2025, SD#8: Other than the openings afforded by the #24-mesh screens on the vents and overflows, all openings on Storage Tank ID: ST04 - Lake Village Concrete tank must be sealed completely to prevent contamination (including contamination carried by insects, rodents, and birds) from entering the water system. Caulking or sealant must not be used. Penetrations into the tank must be through conduit, bulkhead, or other permanent watertight fittings.
Survey Year 2025, SD#5: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST07 - Lake Village Clearwell to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Survey Year 2025, SD#1: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST02 - Bridge Bay Tank to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Survey Year 2025, SD#6: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST08 - Fishing Bridge Clearwell to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Survey Year 2025, SD#4: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST05 - Fishing Bridge Tank to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Survey Year 2025, SD#3: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST04 - Lake Village Concrete tank to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Survey Year 2025, SD#2: During the sanitary survey, the water system could not provide a copy of the most recent storage tank inspection report for Storage Tank ID: ST03 - Lake Village Steel Tank to the surveyor. Systems are required to maintain all relevant records from at least the past 12 years (Title 40 Code of Federal Regulations Section 141.33). The system must obtain documentation of the most recent storage tank inspection and/or cleaning and provide this documentation to EPA Region 8. Given that all storage tanks are planned to be cleaned and inspected this summer (2025), a copy of those most recent reports when they are received will suffice.
Lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. YNP-LAKE VILLAGE is responsible for providing high quality drinking water and removing lead pipes, but cannot control the variety of materials used in plumbing components in your home. You share the responsibility for protecting yourself and your family from the lead in your home plumbing. You can take responsibility by identifying and removing lead materials within your home plumbing and taking steps to reduce your family’s risk. Before drinking tap water, flush your pipes for several minutes by running your tap, taking a shower, doing laundry or a load of dishes. You can also use a filter certified by an American National Standards Institute accredited certifier to reduce lead in drinking water. If you are concerned about lead in your water and wish to have your water tested, contact YNP-LAKE VILLAGE (Public Watersystem Id: WY5680079) by calling 307-254-7565 or emailing steven_hoffman@nps.gov. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available at http://www.epa.gov/safewater/lead.
Water Quality Data Table
In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of contaminants in water provided by public water systems. The table below lists all of the drinking water contaminants that we detected during the calendar year of this report. Although many more contaminants were tested, only those substances listed below were found in your water. All sources of drinking water contain some naturally occurring contaminants. At low levels, these substances are generally not harmful in our drinking water. Removing all contaminants would be extremely expensive, and in most cases, would not provide increased protection of public health. A few naturally occurring minerals may actually improve the taste of drinking water and have nutritional value at low levels. Unless otherwise noted, the data presented in this table is from testing done in the calendar year of the report. The EPA or the State requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not vary significantly from year to year, or the system is not considered vulnerable to this type of contamination. As such, some of our data, though representative, may be more than one year old. In this table you will find terms and abbreviations that might not be familiar to you. To help you better understand these terms, we have provided the definitions below the table.
Contaminant (units)
MCLG or MRDLG
MCL, TT, or MRDL
Detected in your water
Range Low
Range High
Sample date
Violation
Typical source
Disinfectants & Disinfection By-Products (There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants)
Chlorine (as Cl2) (ppm)
4
4
1.2
NA
NA
2025
No
Water additive used to control microbes
Haloacetic Acids (HAA5) (ppb)
NA
60
00
NA
NA
2025
No
By-product of drinking water chlorination
TTHMs [Total Trihalomethanes] (ppb)
NA
80
1
NA
NA
2025
No
By-product of drinking water disinfection
Inorganic Contaminants
Arsenic (ppb)
00
10
2
NA
NA
2023
No
Erosion of natural deposits; Runoff from orchards; Runoff from glass and electronics production wastes
Asbestos (MFL)
7
7
0.18
NA
NA
2023
No
Decay of asbestos cement water mains; Erosion of natural deposits
Fluoride (ppm)
4
4
3.7
NA
NA
2024
No
Erosion of natural deposits; Water additive which promotes strong teeth; Discharge from fertilizer and aluminum factories
Nitrate [measured as Nitrogen] (ppm)
10
10
0.05
0.04
0.05
2025
No
Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits
Radioactive Contaminants
Radium (combined 226/228) (pCi/L)
00
5
1
00
0.9
2025
No
Erosion of natural deposits
Contaminant (units)
MCLG
AL (Action Level)
Your water
Range Low
Range High
# Samples Exceeding AL
Sample date
Exceeds AL
Typical source
Inorganic Contaminants
Copper — action level at consumer taps (ppm)
1.3
1.3
0.313
0.085
0.467
0
2025
No
Corrosion of household plumbing systems; Erosion of natural deposits
Lead — action level at consumer taps (ppb)
00
15
11
00
14
0
2025
No
Corrosion of household plumbing systems; Erosion of natural deposits
Violations and Exceedances
Contaminants
State MCL
Your Water
Violation
Explanation and Comment
Additional Contaminants
In an effort to insure the safest water possible the State has required us to monitor some contaminants not required by Federal regulations. Of those contaminants only the ones listed below were found in your water.
Gross alpha excluding radon and uranium
NA
1 pCi/L
No
Erosion of natural deposits.
Definitions
ug/L:number of micrograms of substance in one liter of water
ppm: parts per million, or milligrams per liter (mg/L)
ppb: parts per billion, or micrograms per liter (μg/L)
pCi/L: picocuries per liter (a measure of radioactivity)
NTU: Nephelometric Turbidity Units. Turbidity is a measure of the cloudiness of the water. We monitor it because it is a good indicator of the effectiveness of our filtration system.
NA: not applicable
ND: Not detected
NR: Monitoring not required, but recommended.
MCLG: Maximum Contaminant Level Goal: The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
TT: Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.
AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Variances and Exemptions: State or EPA permission not to meet an MCL or a treatment technique under certain conditions.
MRDLG: Maximum residual disinfection level goal. The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
MRDL: Maximum residual disinfectant level. The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
MNR: Monitored Not Regulated
MPL: State Assigned Maximum Permissible Level
90th Percentile: Compliance with the lead and copper action levels is based on the 90th percentile lead and copper levels. This means that the concentration of lead and copper must be less than or equal to the action level in at least 90% of the samples collected.
For more information please contact:
Hoffman, Steven
P.O. Box 168
Yellowstone, WY 82190
Phone: 307-254-7565
Last updated: July 7, 2026
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Contact Info
Mailing Address:
PO Box 168
Yellowstone National Park,
WY
82190-0168
