Is Ronan, MT Tap Water Safe? Quality & Contaminants

What was found in Ronan's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate-Nitrite	200 µg/L 2% of the EPA limit 10000 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019 Highest in the city: 316.5 µg/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2019	5/5	SYR4
Copper	255 µg/L 20% of the EPA limit 1300 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019 Highest in the city: 301 µg/L — MISSION MOUNTAIN LAKE CO W AND S DIST · 118 people · 2019	5/5	SYR4
Nitrate	180 µg/L 1.8% of the EPA limit 10000 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 240 µg/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2013	4/5	SYR4
Fluoride	48 µg/L 1.2% of the EPA limit 4000 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 170 µg/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2013	5/5	SYR4
Barium	50 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 90 µg/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2013	5/5	SYR4
Total Haloacetic Acids (HAA5)	17.8 µg/L 30% of the EPA limit 60 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Lead	16.75 µg/L 112% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019	3/5	SYR4
TTHM	15.35 µg/L 19% of the EPA limit 80 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Chloroform	15 µg/L No EPA limit set Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Dichloroacetic Acid	9.72 µg/L No EPA limit set Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Trichloroacetic Acid	8.34 µg/L No EPA limit set Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2019 Highest in the city: 3.9 µg/L — ROUND BUTTE WATER COMPANY · 400 people · 2019	4/5	SYR4
Gross Alpha, Excl. Radon And U	3.44 pCi/L 23% of the EPA limit 15 pCi/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 3.6 pCi/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2013	3/5	SYR4
Combined Radium (-226 And -228)	2.2 pCi/L 44% of the EPA limit 5 pCi/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 3.31 pCi/L — MISSION MOUNTAIN VIEW HOA · 80 people · 2018	3/5	SYR4
Combined Uranium	1.7 µg/L 5.7% of the EPA limit 30 µg/L Main supplier: RONAN CITY OF · 2,483 people · 2017 Highest in the city: 2 µg/L — MISSION MEADOWS RV CAMPSITE PARK, INC · 200 people · 2013	3/5	SYR4
Bromodichloromethane	0.9190 µg/L No EPA limit set Main supplier: RONAN CITY OF · 2,483 people · 2019	1/5	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: RONAN CITY OF · 2,483 people · 2025 Highest in the city: 0.0020 mg/L — ROUND BUTTE WATER COMPANY · 400 people · 2024	5/5	LCR

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Ronan

Supplier	Population served
RONAN CITY OF	2,483
ROUND BUTTE WATER COMPANY	400
MISSION MEADOWS RV CAMPSITE PARK, INC	200
MISSION MOUNTAIN LAKE CO W AND S DIST	118
MISSION MOUNTAIN VIEW HOA	80

Frequently asked questions about Ronan tap water

Is Ronan tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Ronan. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Ronan?

5 public water suppliers report drinking-water monitoring for Ronan, Montana to the EPA. Each is listed above with its population served.

What contaminants are in Ronan's water?

The contaminants EPA monitoring detected in Ronan include Nitrate-Nitrite, Copper, Nitrate, Fluoride, Barium. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.