Is Roundup, MT Tap Water Safe? Quality & Contaminants

What was found in Roundup'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
Copper	381.2 µg/L 29% of the EPA limit 1300 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2018	1/2	SYR4
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2013	1/2	SYR4
Nitrate-Nitrite	100 µg/L 1% of the EPA limit 10000 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
TTHM	51.75 µg/L 65% of the EPA limit 80 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Total Haloacetic Acids (HAA5)	20 µg/L 33% of the EPA limit 60 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Bromodichloromethane	19.35 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Dibromochloromethane	18 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Lead	17.9 µg/L 119% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2018	1/2	SYR4
Chloroform	12.9 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Dichloroacetic Acid	8.35 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Trichloroacetic Acid	5.4 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Dibromoacetic Acid	5.25 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Bromoform	3.855 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	3 pCi/L 60% of the EPA limit 5 pCi/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Combined Uranium	3 µg/L 10% of the EPA limit 30 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2016	1/2	SYR4
Di(2-ethylhexyl) Phthalate	2.2 µg/L 37% of the EPA limit 6 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Selenium	2 µg/L 4% of the EPA limit 50 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2013	1/2	SYR4
Monobromoacetic Acid	1.434 µg/L No EPA limit set Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2019	1/2	SYR4
Lead	0.0410 mg/L 273% above the EPA limit of 0.0150 mg/L Main supplier: ROUNDUP WATER DEPARTMENT · 1,900 people · 2025	2/2	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 Roundup

Supplier	Population served
ROUNDUP WATER DEPARTMENT	1,900
SUNSET COLONY UNAPPROVED	75

Frequently asked questions about Roundup tap water

Is Roundup tap water safe to drink?

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

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

What contaminants are in Roundup's water?

The contaminants EPA monitoring detected in Roundup include Copper, Fluoride, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5). 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.