Is Rosamond, CA Tap Water Safe? Quality & Contaminants

What was found in Rosamond'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	5600 µg/L 56% of the EPA limit 10000 µg/L Highest in the city: LANDS OF PROMISE MWC · 174 people · 2019	3/4	SYR4
Fluoride	509 µg/L 13% of the EPA limit 4000 µg/L Highest in the city: FIRST MUTUAL WATER SYSTEM · 35 people · 2018	3/4	SYR4
Lithium	46.9 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2024	1/4	UCMR-5
Barium	42.9 µg/L 2.1% of the EPA limit 2000 µg/L Highest in the city: 60TH STREET ASSOC. WATER SYSTEM · 39 people · 2019	3/4	SYR4
Copper	29 µg/L 2.2% of the EPA limit 1300 µg/L Highest in the city: LANDS OF PROMISE MWC · 174 people · 2018	1/4	SYR4
TTHM	27.849999999999998 µg/L 35% of the EPA limit 80 µg/L Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Chromium	21.6 µg/L 22% of the EPA limit 100 µg/L Highest in the city: FIRST MUTUAL WATER SYSTEM · 35 people · 2018	2/4	SYR4
Arsenic	21.199999999999996 µg/L 212% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: FIRST MUTUAL WATER SYSTEM · 35 people · 2019	3/4	SYR4
Chloroform	13.6 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Dibromochloromethane	11.9 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Bromoform	11.524999999999997 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Bromodichloromethane	9.049999999999999 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Combined Uranium	7.2861 µg/L 24% of the EPA limit 30 µg/L Highest in the city: FIRST MUTUAL WATER SYSTEM · 35 people · 2017	1/4	SYR4
Dibromoacetic Acid	5.8999999999999995 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Total Haloacetic Acids (HAA5)	5.8999999999999995 µg/L 9.8% of the EPA limit 60 µg/L Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Selenium	4.890000000000001 µg/L 9.8% of the EPA limit 50 µg/L Highest in the city: FIRST MUTUAL WATER SYSTEM · 35 people · 2018	2/4	SYR4
Lead	2.7249999999999996 µg/L 18% of the EPA limit 15 µg/L Highest in the city: LANDS OF PROMISE MWC · 174 people · 2018	1/4	SYR4
Dichloroacetic Acid	1.0950000000000002 µg/L No EPA limit set Main supplier: ROSAMOND CSD · 17,711 people · 2019	1/4	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ROSAMOND CSD · 17,711 people · 2024	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 Rosamond

Supplier	Population served
ROSAMOND CSD	17,711
LANDS OF PROMISE MWC	174
60TH STREET ASSOC. WATER SYSTEM	39
FIRST MUTUAL WATER SYSTEM	35

Frequently asked questions about Rosamond tap water

Is Rosamond tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Rosamond. 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 Rosamond?

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

What contaminants are in Rosamond's water?

The contaminants EPA monitoring detected in Rosamond include Nitrate, Fluoride, Lithium, Barium, Copper. 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.