County · Montana
Cascade County, Montana: drinking water records
Explore EPA records for 47 community water systems across 15 ZIP codes in Cascade County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 3 of the 47 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 47 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Great Falls City of MT0000525 | 60,000 | 120 | 0 | 5 | 12 ppbbelow the action level |
| Malmstrom Air Force Base MT0000515 | 8,850 | 240 | 1 | 2 | 0 ppbbelow the action level |
| Sun Prairie Village County MT0000521 | 1,800 | 60 | 0 | 0 | 1 ppbbelow the action level |
| Black Eagle Cascade County Water Sewer MT0000157 | 1,233 | 0 | 0 | 4 | 0 ppbbelow the action level |
| Homestead Acres County Water and Sewer MT0000526 | 500 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Bushard Water Company MT0005164 | 425 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Ryan Dam Water System MT0000046 | 230 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Stockett Water and Sewer Dist MT0000579 | 210 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Sand Coulee Water Users District MT0000325 | 180 | 0 | 0 | 1 | 3 ppbbelow the action level |
| Big Bend Ranch Subdivision MT0004261 | 100 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Spring Tree Ridge MT0004419 | 80 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Prairie Water Company MT0003539 | 1,000 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cascade Town of MT0000171 | 650 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Belt Town of MT0000138 | 600 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Vaughn Cascade County Water and Sewer MT0000352 | 585 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Two Buttes Water Users Assn MT0000580 | 525 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Gore Hill County Water Dist MT0000232 | 500 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Highwood Mobile Home Park MT0004681 | 400 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Sun Prairie Water District MT0000571 | 350 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Neihart Town of MT0000298 | 229 | 0 | 0 | 0 | 7 ppbbelow the action level |
| South Wind Water and Sewer District MT0000025 | 200 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Tracy Water Users Corp MT0000345 | 200 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Big Stone Colony INC MT0003077 | 130 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Pleasant Park Community INC MT0000028 | 125 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Pleasant Valley Colony MT0003304 | 120 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Cascade Colony MT0001738 | 105 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fairhaven Colony MT0001773 | 105 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Hilltop Colony MT0004854 | 100 | 0 | 0 | 0 | 10 ppbbelow the action level |
| Rivershore Community LLC MT0000414 | 90 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Hillcrest Colony MT0004661 | 89 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Missouri Meadows Community INC MT0000053 | 85 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Grassland Colony MT0004832 | 80 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Red Sky Mobile Home Community MT0004825 | 80 | 0 | 0 | 0 | 1 ppbbelow the action level |
| The Falls Mobile Home Community MT0005077 | 60 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Park Garden Estates MT0000050 | 50 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Windy Acres Wua MT0002806 | 50 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Sunset Mobile Home Park MT0000584 | 45 | 0 | 0 | 0 | 0 ppbbelow the action level |
| High Plains H2o LLC MT0005192 | 25 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Countryside Village MHP Grt Fls MT0004830 | 600 | 0 | 0 | 0 | not reported |
| Great Falls RV Park MT0000027 | 274 | 0 | 0 | 0 | not reported |
| Grandview Trailer Court MT0004686 | 165 | 0 | 0 | 0 | not reported |
| Shade Tree Mobile Park MT0004685 | 100 | 0 | 0 | 0 | not reported |
| Rivers Edge Mobile Home Park Grt Fls MT0004687 | 75 | 0 | 0 | 0 | not reported |
| Big Stack Estates MT0004682 | 60 | 0 | 0 | 0 | not reported |
| Cobblestone Court MT0004831 | 50 | 0 | 0 | 0 | not reported |
| Big Sky Mobile Home Park MT0004683 | 40 | 0 | 0 | 0 | not reported |
| Riceville Heights Subdivision MT0004238 | 25 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Cascade County, Montana. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Cascade County
15ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Black Eagle
- Fort Shaw
- Great Falls
- Hardy
- Monarch
- Neihart
- Riceville
- Sand Coulee
- Simms
- Stockett
- Sun River
- Ulm
- Vaughn
View ZIP areas and understand coverage
- 59401Great Falls
- 59404Great Falls
- 59405Great Falls
- 59412Riceville
- 59414Black Eagle
- 59421Hardy
- 59443Fort Shaw
- 59463Monarch
- 59465Neihart
- 59472Sand Coulee
- 59477Simms
- 59480Stockett
- 59483Sun River
- 59485Ulm
- 59487Vaughn
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.