What was found in Aptos'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 | 5700 µg/L 57% of the EPA limit 10000 µg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2017
Highest in the city: 712516 µg/L — PINE TREE LANE MUTUAL WATER CO · 75 people · 2019 | 3/6 | SYR4 |
| Nitrate | 6328 µg/L 63% of the EPA limit 10000 µg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 3/6 | SYR4 |
| Fluoride | 128 µg/L 3.2% of the EPA limit 4000 µg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2017
Highest in the city: 167 µg/L — PURESOURCE WATER, INC · 210 people · 2019 | 4/6 | SYR4 |
| Copper | 92.85 µg/L 7.1% of the EPA limit 1300 µg/L Highest in the city: PURESOURCE WATER, INC · 210 people · 2019 | 1/6 | SYR4 |
| Lithium | 20.3 µg/L No EPA limit set Highest in the city: TROUT GULCH MUTUAL WATER COMPANY · 614 people · 2025 | 1/6 | UCMR-5 |
| Barium | 19.1 µg/L 1% of the EPA limit 2000 µg/L Highest in the city: CATHEDRAL HILLS MWC, INC · 75 people · 2019 | 2/6 | SYR4 |
| Chromium | 15.4 µg/L 15% of the EPA limit 100 µg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2017 | 4/6 | SYR4 |
| TTHM | 5.68 µg/L 7.1% of the EPA limit 80 µg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 1/6 | SYR4 |
| Bromoform | 4.31 µg/L No EPA limit set Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 1/6 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Highest in the city: TROUT GULCH MUTUAL WATER COMPANY · 614 people · 2016 | 4/6 | SYR4 |
| Chloroform | 2.2 µg/L No EPA limit set Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 1.82 µg/L No EPA limit set Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 1/6 | SYR4 |
| Dibromochloromethane | 1.4 µg/L No EPA limit set Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2019 | 1/6 | SYR4 |
| Arsenic | 1.28 µg/L 13% of the EPA limit 10 µg/L Highest in the city: TROUT GULCH MUTUAL WATER COMPANY · 614 people · 2019 | 2/6 | SYR4 |
| Mercury | 0.0510 µg/L 2.6% of the EPA limit 2 µg/L Highest in the city: TROUT GULCH MUTUAL WATER COMPANY · 614 people · 2016 | 1/6 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CENTRAL WATER DISTRICT · 2,726 people · 2025
Highest in the city: 0.0041 mg/L — PURESOURCE WATER, INC · 210 people · 2025 | 6/6 | LCR |
Water suppliers serving Aptos
| Supplier | Population 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 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.