01The verdict: is Mount Crested Butte water safe?
Mount Crested Butte's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (86.2/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 3,546 residents using surface water (rivers, lakes, or reservoirs).
Copper is over its legal limit
Measured at 1.79 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 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓1 violation 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 ↓Mount Crested Butte's drinking water received a grade of A- (86.2 out of 100), indicating good water quality. The city's 2 water systems serve approximately 3,546 residents using surface water.
Lead levels were measured at 0.0 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 38 violations on record, including 0 health-based violations. 6 remain unresolved.
Mount Crested Butte ranks #50 out of 244 cities in Colorado for water quality, placing it above average in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
02What's in Mount Crested Butte's water
Every contaminant flagged in Mount Crested Butte, 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. | 0.0 | 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. | 1.79 | 1.3 | mg/L | Inorganic | Over Limit |
Cities ranked by 90th-percentile lead PF PFAS in Colorado
Cities ranked by compounds detected Cu Copper in Colorado
Cities ranked by 90th-percentile copper
03Mount Crested Butte'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 38 violations on record, including 0 health-based violations. 6 remain unresolved.
9 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 13 ppb since 1993. Latest reading: 0 ppb (2023) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
▼ Down 0.31 mg/L since 1993. The latest reading (1.8 mg/L, 1998) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Mount Crested Butte's water comes from
Mount Crested Butte's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
2 systems
2 water systems, operated under local government ownership.
3,546 people
Residents served across Mount Crested Butte's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by local government ownership and serves approximately 3,546 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| MOUNT CRESTED BUTTE WSD | CO0126190 | 3,296 | Surface Water |
| MERIDIAN LAKE PARK | CO0126505 | 250 | Surface Water |
Water bodies near Mount Crested Butte
As a surface-water system, these water bodies may directly influence Mount Crested Butte's drinking water supply.
05Pressure on Mount Crested Butte'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
3 federal disaster declarations on record for Gunnison County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Superfund proximity
1 National Priorities List site within 10 miles. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
Drought
Gunnison County is in D4 (exceptional drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How Mount Crested Butte compares
Scores for nearby Colorado cities on one line, with the average marked.
dashed line = Colorado average (45/100)
Mount Crested Butte scores 86.2/100 — above the Colorado average of 45/100. It outscores 10 of 10 nearby cities. Full Colorado rankings →
39.6 / 100FAurora, CO
38.1 / 100FColorado Springs, CO
33.5 / 100DFort Collins, CO
46.8 / 100FLakewood, CO
36.9 / 100FThornton, CO
38 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Mount Crested Butte'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 →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Mount Crested Butte 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 Mount Crested Butte, CO tap water safe to drink?
Mount Crested Butte's water quality earned a grade of A- (86.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #50 out of 244 cities tested in Colorado.
What contaminants are in Mount Crested Butte's water?
Lead was measured at 0.0 ppb (90th percentile). 38 violations are on record.
How is Mount Crested Butte'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 Mount Crested Butte?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mount Crested Butte's water come from?
Mount Crested Butte's water is sourced from Surface water. The city has 2 water systems serving approximately 3,546 residents.
How does Mount Crested Butte's water compare to other cities?
Mount Crested Butte ranks #50 out of 244 cities in Colorado (better than 80% of state cities) and #4813 out of 15382 cities nationally (69th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.