01The verdict: is Great Falls water safe?
Based on EPA testing data, Great Falls's tap water is generally safe to drink. The water system earned a grade of A (93/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 600 residents using surface water (rivers, lakes, or reservoirs).
Nothing over a legal limit
Every contaminant measured in Great Falls's water is within its EPA limit, and no violations are unresolved.
See the testing ↓Monitoring is on schedule
The system is meeting its EPA monitoring and reporting requirements — testing is happening when it should.
See the score ↓A flood-prone service area
5 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓Great Falls's drinking water received a grade of A (93 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 600 residents using purchased surface water.
Lead data is not currently available for this system. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 1 violation on record, including 0 health-based violations. All violations have been resolved.
Great Falls ranks #3 out of 177 cities in Utah for water quality, placing it one of the best 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. As a small community water system, Great Falls may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Great Falls's water
Every contaminant flagged in Great Falls, 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.
No contaminants were measured above screening thresholds in the most recent EPA sampling data for this system. The full testing table below lists everything checked.
Full contaminants report
No contaminant data available for this city.
Cities ranked by 90th-percentile lead PF PFAS in Utah
Cities ranked by compounds detected Cu Copper in Utah
Cities ranked by 90th-percentile copper
03Great Falls'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 1 violation on record, including 0 health-based violations. All violations have been resolved.
All ten of the last ten years were clean — no EPA violations recorded for Great Falls.
04Where Great Falls's water comes from
Great Falls's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Purchased Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Wholesale supplier
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under private ownership.
600 people
Residents served across Great Falls'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 private ownership and serves approximately 600 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| COUNTRYSIDE VILLAGE MHP GRT FLS | MT0004830 | 600 | Purchased Surface Water |
Water bodies near Great Falls
As a surface-water system, these water bodies may directly influence Great Falls's drinking water supply.
05Pressure on Great Falls'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 Utah County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Great Falls compares
Scores for nearby Utah cities on one line, with the average marked.
dashed line = Utah average (50/100)
Great Falls scores 93/100 — above the Utah average of 50/100. It outscores 10 of 10 nearby cities. Full Utah rankings →
35.3 / 100CWest Jordan, UT
65.1 / 100FOrem, UT
40.7 / 100FSandy, UT
39.5 / 100FLehi, UT
44.9 / 100DEagle Mountain, UT
46.9 / 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 Great Falls's water — not generic advice.
A basic carbon filter still helps
Great Falls's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
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 Great Falls 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 Great Falls, UT tap water safe to drink?
Great Falls's water quality earned a grade of A (93/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #3 out of 177 cities tested in Utah.
What contaminants are in Great Falls's water?
1 violation is on record.
How is Great Falls'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 Great Falls?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Great Falls's water come from?
Great Falls's water is sourced from Purchased surface water. The city has 1 water system serving approximately 600 residents.
How does Great Falls's water compare to other cities?
Great Falls ranks #3 out of 177 cities in Utah (better than 98% of state cities) and #1034 out of 15382 cities nationally (93th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Great Falls's small water system affect quality?
Great Falls's system serves approximately 600 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 1 violation on record.