County · Montana
Lewis and Clark County, Montana: drinking water records
Explore EPA records for 56 community water systems across 11 ZIP codes in Lewis and Clark 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 1 of the 56 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 56 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 |
|---|---|---|---|---|---|
| Helena Water System MT0000241 | 32,091 | 270 | 0 | 3 | 3 ppbbelow the action level |
| East Helena City of MT0000196 | 2,114 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Ten Mile and Pleasant Valley Wua MT0002005 | 750 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Skyview Water and Sewer Utility MT0004039 | 400 | 0 | 0 | 2 | 14 ppbbelow the action level |
| Golden Estates Trailer Court MT0000597 | 225 | 0 | 0 | 3 | 0 ppbbelow the action level |
| Holmberg Village Estates MT0004190 | 225 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Glacier Point Ho and Wua MT0004559 | 210 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Elk Creek Colony MT0004739 | 84 | 0 | 0 | 7 | 0 ppbbelow the action level |
| Mcdonald Trailer Ct MT0000402 | 75 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Milford Colony INC MT0001646 | 67 | 0 | 0 | 5 | 0 ppbbelow the action level |
| Blue Cloud Subdivision MT0004288 | 60 | 0 | 0 | 4 | 3 ppbbelow the action level |
| Broadwater Estates HOA MT0004697 | 40 | 0 | 0 | 5 | 0 ppbbelow the action level |
| Bahny Brae Subdivision MT0003196 | 35 | 0 | 0 | 1 | 2 ppbbelow the action level |
| Eastgate Village Sewer and Water MT0001784 | 2,000 | 0 | 0 | 0 | 1 ppbbelow the action level |
| VA Medical Center Helena MT0000246 | 1,275 | 0 | 0 | 0 | 7 ppbbelow the action level |
| Helena Leisure LLC MT0000590 | 1,200 | 0 | 0 | 0 | 1 ppbbelow the action level |
| North Star PUD MT0004264 | 715 | 0 | 0 | 0 | 7 ppbbelow the action level |
| Mchugh Mobile Home Park MT0002917 | 490 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Treasure State Acres Wua MT0002390 | 483 | 0 | 0 | 0 | 2 ppbbelow the action level |
| La Casa Grande Water and Sewer District MT0001924 | 404 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Golden Estates Homeowners Association MT0004187 | 400 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Mobile City Home Park No 2 MT0003043 | 300 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Helena RV and Mobile Home Park MT0000426 | 250 | 0 | 0 | 0 | 12 ppbbelow the action level |
| Ranchview Estates Wua MT0003782 | 250 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Grass Land Estates MT0004448 | 228 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Bridge Creek Estates Subdivision MT0004555 | 205 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pele Park MT0000593 | 186 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Davis Meadow Village MT0003990 | 180 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Mountain Heritage Water System MT0002873 | 175 | 0 | 0 | 0 | 10 ppbbelow the action level |
| Town View Estates Wua INC MT0002172 | 175 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Prairie Mobile Village MT0000600 | 163 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Pebble Gardens Mobile Home Ct MT0000603 | 125 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Homestead Valley Wua Hvha MT0003251 | 105 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Bryant No 3 Subdivision MT0004489 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mobile City Home Park No 1 MT0000601 | 100 | 0 | 0 | 0 | 2 ppbbelow the action level |
| North Forestvale Homeowners MT0001793 | 98 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Camel Mountain HOA MT0000572 | 96 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Camelot HOA MT0000615 | 96 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Buzz Inn MT0000592 | 95 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Masonic Home of Montana MT0000245 | 90 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Park Evergreen Trailer Court MT0000421 | 87 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Applegate Village MT0004144 | 85 | 0 | 0 | 0 | 3 ppbbelow the action level |
| South Forestvale HOA MT0003881 | 82 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Ruger Water District MT0004143 | 79 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Dakota Valley Mobile Home Park MT0004562 | 75 | 0 | 0 | 0 | 13 ppbbelow the action level |
| Barnett Water Users System MT0003183 | 70 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Beacon Trailer Court Helena MT0000596 | 55 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Grand Valley Estates Subdivision MT0004474 | 50 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Helena North KOA MT0003679 | 50 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Moonlight Estates HOA MT0004872 | 44 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Mobile City 3 MT0005088 | 40 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Phoenix Park MT0000594 | 36 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Trails End Tr Park Helena MT0000605 | 35 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rosemarys Addition MT0002743 | 30 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Western Skies Mobile Ct MT0000519 | 25 | 0 | 0 | 0 | 10 ppbbelow the action level |
| Smith Mchugh #2 Blr MT0005253 | 68 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Lewis and Clark 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 Lewis and Clark County
11ZIP 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
- Augusta
- Canyon Creek
- Craig
- Helena
- Helena Valley Northeast
- Helena West Side
- Lincoln
- Marysville
- Spokane Creek
View ZIP areas and understand coverage
- 59410Augusta
- 59601Helena
- 59602Helena Valley Northeast
- 59623Helena
- 59625Helena
- 59633Canyon Creek
- 59635Spokane Creek
- 59636Helena West Side
- 59639Lincoln
- 59640Marysville
- 59648Craig
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.