01The verdict: is Lame Deer water safe?
Lame Deer's drinking water has significant quality concerns based on EPA testing data. With a grade of F (44/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 3,501 residents using groundwater (wells).
Copper is over its legal limit
Measured at 1.65 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Lead is well under the limit
90th-percentile lead is 5.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓32 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Lame Deer's drinking water received a grade of F (44 out of 100), indicating failing water quality. The city's 4 water systems serve approximately 3,501 residents using groundwater.
Lead levels were measured at 5.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 250 violations on record, including 54 health-based violations. 29 remain unresolved.
Lame Deer ranks #94 out of 110 cities in Montana for water quality, placing it among the lowest-rated in the state. Lame Deer relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff. The system has seen 32 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Lame Deer's water
Every contaminant flagged in Lame Deer, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 5.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.65 | 1.3 | mg/L | Inorganic | Over Limit |
Cities ranked by 90th-percentile lead PF PFAS in Montana
Cities ranked by compounds detected Cu Copper in Montana
Cities ranked by 90th-percentile copper
03Lame Deer's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 250 violations on record, including 54 health-based violations. 29 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 7 ppb since 2001. Latest reading: 0 ppb (2025) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
1.6mg/L(2001)
One sampling round on record — 127% of the 1.3mg/L EPA action level. Sampled at higher-risk homes (90th percentile).
04Where Lame Deer's water comes from
Lame Deer's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
4 systems
4 water systems, operated under native american ownership.
3,501 people
Residents served across Lame Deer's service area.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals. Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds. The system is operated by native american ownership and serves approximately 3,501 people through 4 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| LAME DEER WATER SYSTEM | 083090064 | 2,605 | Groundwater |
| BUSBY COMMUNITY WATER SYSTEM | 083090063 | 535 | Groundwater |
| ASHLAND COMMUNITY WATER SYSTEM | 083090061 | 265 | Groundwater |
| BIRNEY VILLAGE | 083090062 | 96 | Groundwater |
Water bodies near Lame Deer
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Lame Deer's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
5 federal disaster declarations on record for Rosebud County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Lame Deer compares
Scores for nearby Montana cities on one line, with the average marked.
dashed line = Montana average (48/100)
Lame Deer scores 44/100 — on par with the Montana average of 48/100. It outscores 7 of 10 nearby cities. Full Montana rankings →
39.6 / 100FMissoula, MT
42.6 / 100FBozeman, MT
43.4 / 100FGreat Falls, MT
34.5 / 100FKalispell, MT
40.1 / 100FHelena, MT
39.1 / 100
07What to do at home
Steps matched to what testing actually found in Lame Deer's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Copper exceeds the EPA action level of 1.3 mg/L
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Lame Deer alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Lame Deer, MT tap water safe to drink?
Lame Deer's water quality earned a grade of F (44/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #94 out of 110 cities tested in Montana.
What contaminants are in Lame Deer's water?
Lead was measured at 5.0 ppb (90th percentile). 250 violations are on record.
How is Lame Deer's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Lame Deer?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lame Deer's water come from?
Lame Deer's water is sourced from Groundwater. The city has 4 water systems serving approximately 3,501 residents.
What health violations has Lame Deer's water system had?
Lame Deer has 54 health-based violations on record. The most recent violation was recorded in September 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 29 violations remain unresolved.
Is Lame Deer's groundwater at risk of contamination?
Lame Deer uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 250 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Lame Deer's water compare to other cities?
Lame Deer ranks #94 out of 110 cities in Montana (better than 15% of state cities) and #14163 out of 15382 cities nationally (8th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.