Tap WaterIndex

← California

Tap water quality report

Aptos, CA

EPA monitoring detected 16 contaminants across the 6 water suppliers serving Aptos. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

6
water suppliers
3,726
people served
16
contaminants found
California rankings Lead in California PFAS in California

What was found in Aptos's water

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

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
750000 µg/L 7500%
of the EPA limit, in the worst sample — 10000 µg/L
 3/6 SYR4
Nitrate
7232 µg/L 72%
of the EPA limit 10000 µg/L
 3/6 SYR4
Fluoride
170 µg/L 4.3%
of the EPA limit 4000 µg/L
 4/6 SYR4
Copper
97 µg/L 7.5%
of the EPA limit 1300 µg/L
 1/6 SYR4
Lithium
20.3 µg/L
No EPA limit set
 1/6 UCMR-5
Barium
20 µg/L 1%
of the EPA limit 2000 µg/L
 2/6 SYR4
Chromium
16 µg/L 16%
of the EPA limit 100 µg/L
 4/6 SYR4
TTHM
6.1 µg/L 7.6%
of the EPA limit 80 µg/L
 1/6 SYR4
Bromoform
4.7 µg/L
No EPA limit set
 1/6 SYR4
Lead
4 µg/L 27%
of the EPA limit 15 µg/L
 4/6 SYR4
Chloroform
2.2 µg/L
No EPA limit set
 1/6 SYR4
Dibromoacetic Acid
1.9 µg/L
No EPA limit set
 1/6 SYR4
Dibromochloromethane
1.4 µg/L
No EPA limit set
 1/6 SYR4
Arsenic
1.3 µg/L 13%
of the EPA limit 10 µg/L
 2/6 SYR4
Mercury
0.0510 µg/L 2.6%
of the EPA limit 2 µg/L
 1/6 SYR4
Lead
0.0041 mg/L 27%
of the EPA limit 0.0150 mg/L
 6/6 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 Aptos

SupplierPopulation served
CENTRAL WATER DISTRICT 2,726
TROUT GULCH MUTUAL WATER COMPANY 614
PURESOURCE WATER, INC 210
PINE TREE LANE MUTUAL WATER CO 75
CATHEDRAL HILLS MWC, INC 75
EMERALD CITY MUTUAL WATER CO 26

Frequently asked questions about Aptos tap water

Is Aptos tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Aptos. 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 Aptos?

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

What contaminants are in Aptos's water?

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