Is Royal Oaks, CA Tap Water Safe? Quality & Contaminants

What was found in Royal Oaks's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate-Nitrite	1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L	11/17	SYR4
Nitrate	81812 µg/L 818% of the EPA limit, in the worst sample — 10000 µg/L	16/17	SYR4
Fluoride	1230 µg/L 31% of the EPA limit 4000 µg/L	14/17	SYR4
Nitrite	700 µg/L 70% of the EPA limit 1000 µg/L	11/17	SYR4
Arsenic	135 µg/L 1350% of the EPA limit, in the worst sample — 10 µg/L	10/17	SYR4
Barium	120 µg/L 6% of the EPA limit 2000 µg/L	13/17	SYR4
TTHM	46 µg/L 57% of the EPA limit 80 µg/L	7/17	SYR4
Copper	38 µg/L 2.9% of the EPA limit 1300 µg/L	7/17	SYR4
Bromoform	36 µg/L No EPA limit set	7/17	SYR4
Chromium	25 µg/L 25% of the EPA limit 100 µg/L	14/17	SYR4
Selenium	23 µg/L 46% of the EPA limit 50 µg/L	7/17	SYR4
Dibromochloromethane	11 µg/L No EPA limit set	6/17	SYR4
Total Haloacetic Acids (HAA5)	9 µg/L 15% of the EPA limit 60 µg/L	6/17	SYR4
Combined Uranium	8.94 µg/L 30% of the EPA limit 30 µg/L	2/17	SYR4
Dibromoacetic Acid	7 µg/L No EPA limit set	6/17	SYR4
Bromodichloromethane	6 µg/L No EPA limit set	5/17	SYR4
Lead	2.1 µg/L 14% of the EPA limit 15 µg/L	5/17	SYR4
Chloroform	2 µg/L No EPA limit set	1/17	SYR4
Dichloroacetic Acid	2 µg/L No EPA limit set	1/17	SYR4
Monobromoacetic Acid	2 µg/L No EPA limit set	2/17	SYR4
Trichloroacetic Acid	1 µg/L No EPA limit set	1/17	SYR4
Lead	0.0089 mg/L 59% of the EPA limit 0.0150 mg/L	17/17	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 single worst sample on record — 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 Royal Oaks

Supplier	Population served
PSMCSD - PAJARO	6,500
PSMCSD - NORMCO	928
PSMCSD - SUNNY MESA	880
PSMCSD - MOSS LANDING HARBOR WS	520
PSMCSD - VEGA RD WS #01	438
PSMCSD - SPRINGFIELD WS	200
PSMCSD - VIERRA ESTATES WS	164
SAN MIGUEL WS #01	100
PSMCSD - LANGLEY/VALLE PACIFICO WS	81
MANZANITA HILLS WA	75
PSMCSD - BLACKIE RD WS	60
DELANY WC	60
ROYAL OAK PLACE WS	60
CHETMOORE ACRES WA	59
APRICOT LN WS	53
MAHER RD WS #05	48
SAN MIGUEL WS #03	45

Frequently asked questions about Royal Oaks tap water

Is Royal Oaks tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Royal Oaks. 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 Royal Oaks?

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

What contaminants are in Royal Oaks's water?

The contaminants EPA monitoring detected in Royal Oaks include Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Arsenic. The full list, with the highest level found 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.