Is Roseville, CA Tap Water Safe? Quality & Contaminants

What was found in Roseville'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	1100 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2018 Highest in the city: 5300 µg/L — ROSECREST MUTUAL · 31 people · 2018	3/3	SYR4
Nitrate	1800 µg/L 18% of the EPA limit 10000 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2019 Highest in the city: 5290 µg/L — ROSECREST MUTUAL · 31 people · 2019	3/3	SYR4
Fluoride	642 µg/L 16% of the EPA limit 4000 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2019	2/3	SYR4
Barium	160 µg/L 8% of the EPA limit 2000 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2019	3/3	SYR4
Nitrite	123.506 µg/L 12% of the EPA limit 1000 µg/L Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2019	2/3	SYR4
Lithium	62.6 µg/L No EPA limit set Main supplier: CITY OF ROSEVILLE · 155,612 people · 2024	1/3	UCMR-5
Dalapon	20 µg/L 10% of the EPA limit 200 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2019	1/3	SYR4
TTHM	19.1 µg/L 24% of the EPA limit 80 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2018	2/3	SYR4
Chloroform	17.95 µg/L No EPA limit set Main supplier: CITY OF ROSEVILLE · 155,612 people · 2018	2/3	SYR4
Monochloroacetic Acid	16 µg/L No EPA limit set Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2015	1/3	SYR4
Total Haloacetic Acids (HAA5)	15.265 µg/L 25% of the EPA limit 60 µg/L Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2015	1/3	SYR4
Chromium	12 µg/L 12% of the EPA limit 100 µg/L Highest in the city: ROSECREST MUTUAL · 31 people · 2018	1/3	SYR4
Lead	9.2 µg/L 61% of the EPA limit 15 µg/L Highest in the city: ROSECREST MUTUAL · 31 people · 2018	1/3	SYR4
Arsenic	3.07 µg/L 31% of the EPA limit 10 µg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2019 Highest in the city: 6.38925 µg/L — GOLD HILL MOBILEHOME PARK · 75 people · 2019	3/3	SYR4
Cadmium	3.2 µg/L 64% of the EPA limit 5 µg/L Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2019	1/3	SYR4
Bromodichloromethane	2.4 µg/L No EPA limit set Main supplier: CITY OF ROSEVILLE · 155,612 people · 2018	2/3	SYR4
Dibromochloromethane	1.3 µg/L No EPA limit set Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2014	1/3	SYR4
Trichloroacetic Acid	1.3 µg/L No EPA limit set Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2014	1/3	SYR4
Thallium, Total	0.7917 µg/L 40% of the EPA limit 2 µg/L Highest in the city: GOLD HILL MOBILEHOME PARK · 75 people · 2019	1/3	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF ROSEVILLE · 155,612 people · 2024 Highest in the city: 0.0034 mg/L — GOLD HILL MOBILEHOME PARK · 75 people · 2024	3/3	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 Roseville

Supplier	Population served
CITY OF ROSEVILLE	155,612
GOLD HILL MOBILEHOME PARK	75
ROSECREST MUTUAL	31

Frequently asked questions about Roseville tap water

Is Roseville tap water safe to drink?

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

3 public water suppliers report drinking-water monitoring for Roseville, California to the EPA. Each is listed above with its population served.

What contaminants are in Roseville's water?

The contaminants EPA monitoring detected in Roseville include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Nitrite. 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.