Water Department
General info
General Information
Big Sky County Water & Sewer District No. 363 (WSD 363)
WSD 363 operates the public water system serving Mountain Village, Lone Moose Meadows, Meadow Village (including Town Center, West Fork, and South Fork subdivisions), Sweetgrass Hills, Aspen Groves, Hidden Village, PowderLight, and Cold Smoke Subdivisions.
Our water comes from multiple deep groundwater wells that provide naturally high-quality drinking water. Big Sky’s remote location protects us from many water quality issues seen in more urban areas—our water was even named “Best Tasting Water in America” at the 2015 American Water Works Association convention. Learn more about water quality »
Challenges & Conservation
With over 2,100 feet of elevation change across our system and complex geology, water pressure management and supply are ongoing challenges. Conservation is critical, especially in summer when irrigation demands can spike system use by more than 300%—right when wildfire risk is highest. To help protect storage levels, irrigation restrictions are in effect June 1–September 15 each year. See irrigation guidelines »
Rates & Tools
Our tiered water rates encourage conservation—the more you use, the more it costs per gallon. You can track your usage, find conservation tips, and pay your bill online with our WaterSmart tool. Explore conservation tips » | Set up WaterSmart account »
Bulk Water Sales
Bulk water is available for haulers, contractors, and landscapers from May 1–Oct 31 (weather dependent) at our fill station:
📍 561 Little Coyote Rd, 8:00 am–4:30 pm
A fire hydrant use form is required for access. Download permit »
🚰 Coming in 2026 – WSD 363 will open a new bulk fill station, available year-round and 24/7, providing greater flexibility and reliability for water haulers and contractors.
Contractor Resources
For specifications, drawings, fire flow data, or details on new service connections and extensions, visit: District Standards »
Information
Informational videos
Our collection of informational videos is dedicated to educating customers like you about essential topics related to your water service. In particular, we have focused on two crucial areas: Pressure Reducing Valves (PRVs) and backflow prevention. Our videos cover everything you need to know about PRVs, including their function, how often to have them serviced, and why they are important for your water system. We also have an informative video on backflow prevention, which is a critical aspect of protecting your water supply from contamination. Whether you’re a homeowner, business owner, or simply interested in learning more about your water service, our videos are an invaluable resource. So take a look, and feel free to reach out to us with any questions or concerns you may have!
Understanding PRV's
Understanding Backflow
water quality
SAFE DRINKING WATER
The Safe Drinking Water Act (SDWA) protects the quality of drinking water across the U.S. It requires all public water systems, including Big Sky’s, to regularly test water sources for more than 90 primary contaminants—including inorganics, organics, radionuclides, and microorganisms.
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Primary standards are enforceable and based on health protection.
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Secondary standards are non-enforceable guidelines based on aesthetics such as taste, odor, and color, as well as properties like hardness and corrosivity.
A full list of test results for all District wells is available at our office, and summarized each year in our Consumer Confidence Report (CCR).
Consumer Confidence Report (CCR)
Every public water supplier must provide a CCR to customers by July 1 each year, covering the previous calendar year. The CCR includes:
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Water source and quality
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Compliance and treatment information
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Any exceedances of primary standards
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Health and educational information
You can view the most recent CCR and reports from the last five years here: View CCR Reports »
Hard copies are also available at the District office.
PFAS Testing
In addition to required SDWA monitoring, WSD 363 has tested its wells for Per- and Polyfluoroalkyl Substances (PFAS). These are emerging contaminants of national concern because they persist in the environment and may affect human health. All of Big Sky’s PFAS test results are well below EPA’s proposed regulatory limits. This means our water continues to meet all state and federal drinking water standards.
For details, see the latest CCR or contact our office to review full PFAS sampling results.
Water Hardness
Water hardness is a secondary standard but is often of interest to our customers:
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Meadow Village wells: ~260 mg/L (very hard)
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Mountain Village wells: ~63 mg/L (moderately hard)
Additional Information
Below are some of the most requested water quality parameters. For a complete list, please see the current CCR. If you have questions, please contact our office and ask to speak with one of our water operators.
Consumer Confidence Reports
Also known as an Annual Water Quality Report or Drinking Water Quality Report, the CCR provides important information about your local drinking water quality. The U.S. Environmental Protection Agency (EPA) requires every community water supplier to deliver this report to customers each year by July 1, under the Consumer Confidence Report Rule.
Our District publishes a CCR each year that summarizes the quality of drinking water for our two permitted public water systems: Meadow Village and Mountain Village. Each report includes a summary table of testing results and other important details about your water.
Click the links below to view the CCRs for the past six years. Hard copies are also available at our office upon request.
For more information about Consumer Confidence Reports, please visit the EPA website.
2024 – Most Current CCR Report
Current & Past CCR Reports
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2024 | 2023 |
2022 | 2021 | 2020 |
2019 | 2018 | 2017 |
1 *Includes Meadow and Mountain Village water systems
2 *Includes Meadow & Mountain Water Systems (Aspen Groves is part of the Mountain System)
GENERAL WATER QUALITY INFORMATION
MOUNTAIN SYSTEM | |
Parameter | Amount Detected |
Calcium | 21.4 mg/l |
Magnesium | 5.2 mg/l |
Potassium | 0.9 mg/l |
Sodium | 15.4 mg/l |
Hardness, Total as CaCO3 | 73.2 mg/l |
Chloride | 11.6 mg/l |
Sulfate | 7.1 mg/l |
Alkalinity as CaCO3 | 83.1 mg/l |
Specific Conductance @ 25°C | 141 umhos/cm |
Solids, Total Dissolved – Calculated | 152 mg/l |
pH | 7.8 s.u. |
Nitrogen, Nitrate plus Nitrite | 0.4 mg/l |
Iron, Total | 0.02 mg/l |
Fluoride1 | <0.1 mg/l |
MEADOW SYSTEM | |
Parameter | Amount Detected |
Calcium | 87.8 mg/l |
Magnesium | 18.2 mg/l |
Potassium | 2.5 mg/l |
Sodium | 19.0 mg/l |
Hardenss, Total as CaCO3 | 270 mg/l |
Chloride | 38.7 mg/l |
Sulfate | 12.7 mg/l |
Alkalinity as CaCO3 | 212 mg/l |
Specific Conductance @ 25°C | 549 umhos/cm |
Solids, Total Dissolved – Calculated | 372 mg/l |
pH | 7.6 s.u. |
Nitrogen, Nitrate plus Nitrite | 3.7 mg/l |
Iron, Total | 0.02 mg/l |
Fluoride1 | <0.1 mg/l |
*Floride is considered an inorganic chemical and is not sampled for under domestic use parameters.
PFAS Monitoring Results – UCMR 5
Public Water System ID: MT0002385
System Name: Big Sky County Water & Sewer District 363
MEADOW & MOUNTAIN ENTRY POINTS | |
Analyte Name | Reported Value |
PFBS | <0.003 µg/l |
PGHpA | <0.003 µg/l |
PFHxS | <0.003 µg/l |
PFNA | <0.004 µg/l |
PFOS | <0.004 µg/l |
PFOA | <0.004 µg/l |
PFDA | <0.003 µg/l |
PFDoA | <0.003 µg/l |
PFHxA | <0.003 µg/l |
PFUnA | <0.002 µg/l |
11Cl-PF3OUdS | <0.005 µg/l |
9Cl-PF3ONS | <0.002 µg/l |
ADONA | <0.003 µg/l |
HFPO-DA | <0.005 µg/l |
PFBA | <0.005 µg/l |
6:2 FTS |
<0.005 µg/l |
4:2 FTS |
<0.003 µg/l |
8:2 FTS |
<0.005 µg/l |
PFMPA |
<0.004 µg/l |
PFPeA |
<0.003 µg/l |
PFMBA |
<0.003 µg/l |
PFEESA |
<0.003 µg/l |
NFDHA |
<0.02 µg/l |
PFPeS |
<0.004 µg/l |
PFHpS |
<0.003 µg/l |
Sampling (March 2025)
Sampling Date: March 18, 2025
Method Used: EPA 533
UV TREATMENT PLANT ENTRY POINTS | |
Analyte Name | Reported Value |
PFBS | <0.003 µg/l |
PGHpA | <0.003 µg/l |
PFHxS | <0.003 µg/l |
PFNA | <0.004 µg/l |
PFOS | <0.004 µg/l |
PFOA | <0.004 µg/l |
PFDA | <0.003 µg/l |
PFDoA | <0.003 µg/l |
PFHxA | <0.003 µg/l |
PFUnA | <0.002 µg/l |
11Cl-PF3OUdS | <0.005 µg/l |
9Cl-PF3ONS | <0.002 µg/l |
ADONA | <0.003 µg/l |
HFPO-DA | <0.005 µg/l |
PFBA | <0.005 µg/l |
6:2 FTS |
<0.005 µg/l |
4:2 FTS |
<0.003 µg/l |
8:2 FTS |
<0.005 µg/l |
PFMPA |
<0.004 µg/l |
PFPeA |
<0.003 µg/l |
PFMBA |
<0.003 µg/l |
PFEESA |
<0.003 µg/l |
NFDHA |
<0.02 µg/l |
PFPeS |
<0.004 µg/l |
PFHpS |
<0.003 µg/l |
Irrigation
Irrigation restrictions
Outdoor watering in Big Sky has a major impact on our water system. During the summer months, irrigation demand can increase overall water use by up to 300%, and some individual customers see usage rise by as much as 600%. This seasonal strain makes it harder to keep storage tanks at safe levels—especially critical during wildfire season.
To protect our water supply, irrigation restrictions are in effect each year from June 1 through September 15. These rules are designed to conserve water, maintain storage levels for fire protection, and ensure reliable service for all customers.
➡️ Enforcement: Irrigation restrictions are backed by District ordinance. Failure to follow these rules is a violation and may result in fines.
Xeriscaping & Water-Smart Landscaping
Many Big Sky homeowners and businesses are reducing their outdoor water use by replacing traditional lawns with xeriscaping—a landscaping method that uses native plants, rocks, and mulch to create beautiful, low-maintenance yards that require little to no irrigation. Benefits include:
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Significant reductions in water use
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Lower summer water bills
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Landscapes that thrive in Big Sky’s “high and dry” climate
Irrigation Tips
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Water early in the morning or late in the evening to reduce evaporation
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Use drip irrigation instead of sprinklers whenever possible
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Check your irrigation system for leaks regularly
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Follow seasonal restrictions to avoid fines and conserve water
Current Irrigation Restrictions: LEVEL TWO
Conservation
Conservation Tips
If you’re a homeowner in Big Sky, Montana, you know that water is a precious resource. With a dry climate and limited water supply, it’s important to use high-efficiency irrigation techniques to conserve water and maintain a healthy landscape. Here are some tips on how to implement these techniques:
Install a Smart Irrigation Controller: A smart irrigation controller uses weather data to adjust watering schedules automatically. By only watering when necessary, you can conserve water and save money on your water bill.
Use Drip Irrigation: Drip irrigation delivers water directly to the roots of your plants, reducing water waste and promoting healthy growth. This method is also ideal for sloped or irregularly shaped landscapes.
Choose Native Plants: Native plants are adapted to the local climate and require less water than non-native species. By incorporating these plants into your landscape, you can conserve water and create a beautiful, low-maintenance outdoor space.
Mulch Your Garden Beds: Mulching helps to retain moisture in the soil, reducing the need for frequent watering. It also suppresses weeds, which can compete with your plants for water and nutrients.
Regularly Inspect and Maintain Your Irrigation System: Regularly inspecting and maintaining your irrigation system can help to identify leaks, broken sprinkler heads, or other issues that can waste water. Fixing these issues promptly can save you money and help conserve water.
By implementing these high-efficiency irrigation techniques, you can reduce your water usage and maintain a healthy, beautiful landscape in Big Sky, Montana. Remember, every drop counts, so do your part to conserve this precious resource!
Fix a leak
Not only will fixing household leaks save money on your monthly bills, it saves water for our community. This annual event encourages residents to find and fix household leaks – but remember – you can find and fix leaks inside and outside your home or business all year long to save valuable water.
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Take the 10-minute challenge to identify where leaks exist
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Check out this handy guide by the EPA to address leaky faucets, toilets, showerheads, and sprinkler systems. Or, if you’re not into DIY, call a plumber.
There are a number of easy ways to save water, and they all start with YOU.
When you save water, you save money on your utility bills.
The first step is to make sure you are using all the water you are paying for.
Check your house for leaks, especially if you have an unexpectedly high water bill.
Once you are sure you don’t have any leaks, here are just a few ways to conserve water.
Kitchen
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- When washing dishes by hand, don’t let the water run while rinsing. Fill one sink with wash water and the other with rinse water.
- Some refrigerators, air conditioners and ice-makers are cooled with wasted flows of water. Consider upgrading with air-cooled appliances for significant water savings.
- Never run the dishwasher without a full load. This practice will save water, energy, detergent, and money.
- Use the garbage disposal sparingly. Compost vegetable food waste instead and save gallons every time.
- For cold drinks keep a pitcher of water in the refrigerator instead of running the tap. This way, every drop goes down you and not the drain.
- Use a small pan of cold water when cleaning vegetables, rather than letting the water run over them. Then, collect the water you use for rinsing fruits and vegetables, and reuse it to water house plants.
- Use only a little water in the pot and put a lid on it for cooking most food. Not only does this method save water, but food is more nutritious since vitamins and minerals are not poured down the drain with the extra cooking water.
- Designate one glass for your drinking water each day or refill a water bottle. This will cut down on the number of glasses to wash.
- Don’t use running water to thaw food. Defrost food in the refrigerator for water efficiency and food safety.
- If your dishwasher is new, cut back on rinsing. Newer models clean more thoroughly than older ones.
- If you accidentally drop ice cubes when filling your glass from the freezer or when you have ice left in your cup from a take-out restaurant, don’t throw it in the trash, dump it on a plant, instead.
Always keep water conservation in mind, and think of other ways to save in the kitchen. Making too much coffee or letting ice cubes melt in the sink can add up over time. By making these small changes in the kitchen, you can count on bigger savings on your yearly water bill.
Bathroom
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- Shorten your shower by a minute or two and you’ll save up to 150 gallons per month.
- Turn off the water while brushing your teeth and save 25 gallons a month.
- Take a shower instead of taking a bath. Showers with low-flow shower heads use less water than taking a bath.
- Turn off the water while you wash your hair to save up to 150 gallons a month.
- Reduce the level of the water being used in a bathtub by one or two inches if a shower is not available.
- When remodeling a bathroom, install a new low-volume flush toilet that uses only 1.6 gallons per flush.
- Test toilets for leaks. Add a few drops of food coloring or a dye tablet to the water in the tank, but do not flush the toilet. Watch to see if the coloring appears in the bowl within a few minutes. If it does, the toilet has a silent leak that needs to be repaired.
- Use a toilet tank displacement device such as a toilet dam or bag. Another alternative is filling a plastic bottle with stones or water, recapped, and placed in the toilet tank. These devices will reduce the volume of water in the tank but will still provide enough for flushing. Displacement devices are not recommended with new low-volume flush toilets.
- Never use the toilet to dispose of cleansing tissues, cigarette butts, or other trash. This wastes a great deal of water and also places an unnecessary load on the sewage treatment plant or septic tank.
- Do not use hot water when cold will do. Water and energy can be saved by washing hands with soap and cold water. Hot water should be added only when hands are especially dirty.
- Do not let the water run when washing hands. Water should be turned off while washing and scrubbing and be turned on again to rinse. A cutoff valve may be installed on the faucet.
- When shaving, fill the lavatory basin with hot water instead of letting the water run continuously.
- Place water-saving aerators on all of your faucets.
Laundry Room
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- Use your clothes washer and dishwasher only when they are full. This will save up to 1,000 gallons a month.
- Washing dark clothes in cold water saves both water and energy while it helps your clothes to keep their colors.
- When doing laundry, match the water level to the size of the load.
Plumbing & Appliances
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- Check water requirements of various models and brands when considering purchasing any new appliances. Some use less water than others.
- Check all waterline connections and faucets for leaks. A slow drip can waste as much as 170 gallons of water EACH DAY, or 5,000 gallons per month, and will add to the water bill.
- Learn to repair faucets so that drips can be corrected promptly. It is easy to do, costs very little, and can mean a substantial savings in plumbing and water bills.
- Check for hidden water leakage such as a leak between the water meter and the house. To check, turn off all indoor and outdoor faucets and water-using appliances. The water meter should be read at 10 to 20 minute intervals. If it continues to run or turn, a leak probably exists and needs to be located.
- Insulate all hot water pipes to reduce the delays (and wasted water) experienced while waiting for the water to “run hot.”
- Be sure the water heater thermostat is not set too high. Extremely hot settings waste water and energy because the water often has to be cooled with cold water before it can be used.
- Use a moisture meter to determine when house plants need water. More plants die from over-watering than from being on the dry side.
- Winterize outdoor spigots and faucets when cold temperatures arrive to prevent pipes from freezing and bursting.
Outdoors
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- Water only when needed. Look at the grass, feel the soil, or use a soil moisture meter to determine when to water.
- Do not over-water. Soil can hold only so much moisture, and the rest simply runs off. A timer will help, and either a kitchen timer or an alarm clock will do. Apply only enough water to fill the plant’s root zone. Excess water beyond that is wasted. One and a half inches of water applied once a week in the summer will keep most grasses alive and healthy.
- Water lawns early in the morning during the hotter summer months. Otherwise, much of the water used on the lawn can simply evaporate between the sprinkler and the grass.
- To avoid excessive evaporation, use a sprinkler that produces large drops of water, rather than a fine mist. Sprinklers that send droplets out on a low angle also help control evaporation. Adjust sprinkler heads as necessary, to avoid waste, runoff and ensure proper coverage.
- Set automatic sprinkler systems to provide thorough, but infrequent watering. Pressure-regulating devices should be set to design specifications. Rain shut-off devices can prevent watering in the rain.
- Use drip irrigation systems for bedded plants, trees, or shrubs, or turn soaker hoses upside-down so the holes are on the bottom. This will help avoid evaporation.
- Water slowly for better absorption, and never water on a windy day.
- Forget about watering the streets or walks or driveways. They will never grow a thing.
- Condition the soil with mulch or compost before planting grass or flowerbeds so that water will soak in rather than run off.
- Fertilize lawns at least twice a year for root stimulation, but do not over-fertilize. Grass with a good root system makes better use of less water and is more drought-tolerant.
- Do not scalp lawns when mowing during hot weather. Taller grass holds moisture better. Grass should be cut fairly often, so that only 1/2 to 3/4 inch is trimmed off. A better looking lawn will result.
- Use a watering can or hand water with the hose in small areas of the lawn that need more frequent watering (those near walks or driveways or in especially hot, sunny spots.)
- Use water-wise plants. Learn what types of grass, shrubbery, and plants do best in the area and in which parts of the lawn, and then plant accordingly. Choose plants that have low water requirements, are drought-tolerant, and are adapted to the area of the state where they are to be planted.
- Consider decorating some areas of the lawn with wood chips, rocks, gravel, or other materials now available that require no water at all.
- Do not “sweep” walks and driveways with the hose. Use a broom or rake instead.
- When washing the car, use a bucket of soapy water and turn on the hose only for rinsing.
- We’re more likely to notice leaks indoors, but don’t forget to check outdoor faucets, sprinklers and hoses for leaks.
More Great Conservation Resources
Montana Rural Water
Click here to go to the Montana Water Rural Water Systems website ad learn about water & waste management
EPA Conservation Tips
Click here to view the EPA’s water conservation tips that you can use everyday at home.
Gallatin River Task Force
Click here to go to the Gallatin River Task Force website, and learn more about how to conserve water in your Big Sky home.
Grow Wild
Click here to go to the Grow Wild Montana website, and learn more about xeriscaping in Montana and how to conserve water in your Big Sky home.