Is Sidney, MT Tap Water Safe? Quality & Contaminants

What was found in Sidney'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	5020 µg/L 50% of the EPA limit 10000 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2019	3/4	SYR4
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2017 Highest in the city: 2355 µg/L — RICHLAND CO VALLEY VIEW WUA · 85 people · 2019	3/4	SYR4
Copper	230.1 µg/L 18% of the EPA limit 1300 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2017 Highest in the city: 361.8 µg/L — DRY REDWATER REGIONAL WATER AUTHORITY · 365 people · 2018	4/4	SYR4
Barium	109.5 µg/L 5.5% of the EPA limit 2000 µg/L Highest in the city: RICHLAND CO VALLEY VIEW WUA · 85 people · 2019	1/4	SYR4
Lithium	37.7 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2025	1/4	UCMR-5
Lead	33.2 µg/L 221% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2017	3/4	SYR4
TTHM	24.8 µg/L 31% of the EPA limit 80 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2019	2/4	SYR4
Dibromochloromethane	9.94 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	1/4	SYR4
Gross Alpha, Excl. Radon And U	9.625 pCi/L 64% of the EPA limit 15 pCi/L Highest in the city: RICHLAND CO VALLEY VIEW WUA · 85 people · 2014	1/4	SYR4
Bromodichloromethane	7.46 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	1/4	SYR4
Combined Uranium	5.8 µg/L 19% of the EPA limit 30 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2017	2/4	SYR4
Bromoform	3.95 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	1/4	SYR4
Chloroform	3.82 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	2/4	SYR4
Total Haloacetic Acids (HAA5)	3.31 µg/L 5.5% of the EPA limit 60 µg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2019	2/4	SYR4
Arsenic	3 µg/L 30% of the EPA limit 10 µg/L Highest in the city: MOUNT PLEASANT ESTATES · 45 people · 2019	1/4	SYR4
Dibromoacetic Acid	2.365 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	1/4	SYR4
Dichloroacetic Acid	1.0835 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	2/4	SYR4
Combined Radium (-226 And -228)	0.8000 pCi/L 16% of the EPA limit 5 pCi/L Highest in the city: MOUNT PLEASANT ESTATES · 45 people · 2016	1/4	SYR4
Trichloroacetic Acid	0.7440 µg/L No EPA limit set Main supplier: SIDNEY CITY OF · 5,000 people · 2019	2/4	SYR4
Lead	0.0040 mg/L 27% of the EPA limit 0.0150 mg/L Main supplier: SIDNEY CITY OF · 5,000 people · 2023 Highest in the city: 0.0050 mg/L — RICHLAND CO VALLEY VIEW WUA · 85 people · 2025	4/4	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 Sidney

Supplier	Population served
SIDNEY CITY OF	5,000
DRY REDWATER REGIONAL WATER AUTHORITY	365
RICHLAND CO VALLEY VIEW WUA	85
MOUNT PLEASANT ESTATES	45

Frequently asked questions about Sidney tap water

Is Sidney tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Sidney. 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 Sidney?

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

What contaminants are in Sidney's water?

The contaminants EPA monitoring detected in Sidney include Nitrate-Nitrite, Fluoride, Copper, Barium, Lithium. 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.