What was found in Los Gatos'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 | 580 µg/L 5.8% of the EPA limit 10000 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 304021 µg/L — MOUNTAIN SPRINGS MUTUAL WATER COMPANY · 40 people · 2018 | 6/10 | SYR4 |
| Nitrate | 3300 µg/L 33% of the EPA limit 10000 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019 | 7/10 | SYR4 |
| Fluoride | 100 µg/L 2.5% of the EPA limit 4000 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 1209.5 µg/L — LUPIN LODGE · 300 people · 2019 | 7/10 | SYR4 |
| Barium | 90.515 µg/L 4.5% of the EPA limit 2000 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 488.5 µg/L — LUPIN LODGE · 300 people · 2019 | 5/10 | SYR4 |
| Copper | 22 µg/L 1.7% of the EPA limit 1300 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 183.8 µg/L — MOUNTAIN SPRINGS MUTUAL WATER COMPANY · 40 people · 2018 | 4/10 | SYR4 |
| TTHM | 15 µg/L 19% of the EPA limit 80 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 103.5 µg/L — RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 10/10 | SYR4 |
| Chloroform | 89.75 µg/L No EPA limit set Highest in the city: RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 9/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4 µg/L 6.7% of the EPA limit 60 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 81.8 µg/L — RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 10/10 | SYR4 |
| Lead | 61.81 µg/L 412% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: MOUNTAIN SPRINGS MUTUAL WATER COMPANY · 40 people · 2018 | 5/10 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 50.6 µg/L — RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 10/10 | SYR4 |
| Dichloroacetic Acid | 32.2 µg/L No EPA limit set Highest in the city: RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 9/10 | SYR4 |
| Dibromochloromethane | 5 µg/L No EPA limit set Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 22.4 µg/L — BRUSH AND OLD WELL MUTUAL WATER COMPANY · 70 people · 2019 | 10/10 | SYR4 |
| Bromoform | 8 µg/L No EPA limit set Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 19 µg/L — BRUSH AND OLD WELL MUTUAL WATER COMPANY · 70 people · 2019 | 8/10 | SYR4 |
| Bromodichloromethane | 2 µg/L No EPA limit set Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 15.7 µg/L — RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 10/10 | SYR4 |
| Thallium, Total | 10 µg/L 500% of the EPA limit, at the 95th percentile of samples — 2 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019 | 1/10 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 8.9 µg/L — VISTA GRANDE WATER USERS ASSOCIATION · 79 people · 2019 | 10/10 | SYR4 |
| Arsenic | 3.2 µg/L 32% of the EPA limit 10 µg/L Highest in the city: MELODY WOODS WATER COMPANY · 168 people · 2019 | 4/10 | SYR4 |
| Chromium | 1.96 µg/L 2% of the EPA limit 100 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019 | 4/10 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 1.5 µg/L — RAINERI MUTUAL WATER COMPANY · 145 people · 2019 | 3/10 | SYR4 |
| Combined Uranium | 1.23655 µg/L 4.1% of the EPA limit 30 µg/L Highest in the city: LUPIN LODGE · 300 people · 2012 | 1/10 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Highest in the city: BRUSH AND OLD WELL MUTUAL WATER COMPANY · 70 people · 2019 | 1/10 | SYR4 |
| Gross Beta Particle Activity | 1.05 pCi/L No EPA limit set Highest in the city: LUPIN LODGE · 300 people · 2018 | 1/10 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019 | 2/10 | SYR4 |
| Nitrite | 0.3000 µg/L 0% of the EPA limit 1000 µg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2019
Highest in the city: 0.3800 µg/L — LUPIN LODGE · 300 people · 2019 | 2/10 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.2900 µg/L 4.8% of the EPA limit 6 µg/L Highest in the city: LUPIN LODGE · 300 people · 2019 | 1/10 | SYR4 |
| Asbestos | 0.2000 MFL 2.9% of the EPA limit 7 MFL Highest in the city: LUPIN LODGE · 300 people · 2019 | 1/10 | SYR4 |
| Lead | 0.0046 mg/L 31% of the EPA limit 0.0150 mg/L Main supplier: COYOTE VALLEY RV RESORT · 500 people · 2025
Highest in the city: 0.0060 mg/L — LAKE CANYON MUTUAL WATER COMPANY · 156 people · 2025 | 10/10 | 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 Los Gatos
Frequently asked questions about Los Gatos tap water
Is Los Gatos tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Los Gatos. 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 Los Gatos?
10 public water suppliers report drinking-water monitoring for Los Gatos, California to the EPA. Each is listed above with its population served.
What contaminants are in Los Gatos's water?
The contaminants EPA monitoring detected in Los Gatos include Nitrate-Nitrite, Nitrate, Fluoride, 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.