What was found in Tracy'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 | 796999.9999999998 µg/L 7970% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 6/6 | SYR4 |
| Nitrate | 2834.9999999999995 µg/L 28% of the EPA limit 10000 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019
Highest in the city: 9963.27 µg/L — LA TORRES PARK · 40 people · 2019 | 6/6 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 4/6 | SYR4 |
| TTHM | 71 µg/L 89% of the EPA limit 80 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 2/6 | SYR4 |
| Lithium | 28.5 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2025
Highest in the city: 66.2 µg/L — SAN JOAQUIN RIVER CLUB INC · 600 people · 2024 | 2/6 | UCMR-5 |
| Chloroform | 59 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.39999999999998 µg/L 67% of the EPA limit 60 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 2/6 | SYR4 |
| Barium | 30.4 µg/L 1.5% of the EPA limit 2000 µg/L Highest in the city: CURRIER ESTATES WATER CORP · 148 people · 2017 | 1/6 | SYR4 |
| Dibromochloromethane | 28 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 2/6 | SYR4 |
| Bromoform | 26 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 2/6 | SYR4 |
| Dichloroacetic Acid | 22 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Copper | 20 µg/L 1.5% of the EPA limit 1300 µg/L Highest in the city: CURRIER ESTATES WATER CORP · 148 people · 2017 | 1/6 | SYR4 |
| Trichloroacetic Acid | 19 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Combined Uranium | 2.3541999999999996 µg/L 7.8% of the EPA limit 30 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2017
Highest in the city: 17.88 µg/L — SAN JOAQUIN RIVER CLUB INC · 600 people · 2018 | 2/6 | SYR4 |
| Bromodichloromethane | 15 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Chromium | 14 µg/L 14% of the EPA limit 100 µg/L Highest in the city: SAN JOAQUIN RIVER CLUB INC · 600 people · 2017 | 1/6 | SYR4 |
| Dibromoacetic Acid | 11 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 2/6 | SYR4 |
| Selenium | 7.68 µg/L 15% of the EPA limit 50 µg/L Highest in the city: 132 INVESTMENTS WATER SYSTEM · 252 people · 2018 | 3/6 | SYR4 |
| Arsenic | 3.979999999999999 µg/L 40% of the EPA limit 10 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019
Highest in the city: 4.38 µg/L — 132 INVESTMENTS WATER SYSTEM · 252 people · 2018 | 4/6 | SYR4 |
| Monochloroacetic Acid | 2.1 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Lead | 1.3 µg/L 8.7% of the EPA limit 15 µg/L Highest in the city: CURRIER ESTATES WATER CORP · 148 people · 2017 | 1/6 | SYR4 |
| Dichloromethane | 1.2779999999999998 µg/L 26% of the EPA limit 5 µg/L Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Monobromoacetic Acid | 1.27 µg/L No EPA limit set Main supplier: TRACY, CITY OF · 96,609 people · 2019 | 1/6 | SYR4 |
| Mercury | 0.0300 µg/L 1.5% of the EPA limit 2 µg/L Highest in the city: CURRIER ESTATES WATER CORP · 148 people · 2017 | 1/6 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TRACY, CITY OF · 96,609 people · 2024
Highest in the city: 0.0047 mg/L — 132 INVESTMENTS WATER SYSTEM · 252 people · 2025 | 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 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 Tracy
| Supplier | Population served |
|---|---|
| TRACY, CITY OF | 96,609 |
| SAN JOAQUIN RIVER CLUB INC | 600 |
| 132 INVESTMENTS WATER SYSTEM | 252 |
| CURRIER ESTATES WATER CORP | 148 |
| LA TORRES PARK | 40 |
| LODI HOMES | 39 |
Frequently asked questions about Tracy tap water
Is Tracy tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Tracy. 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 Tracy?
6 public water suppliers report drinking-water monitoring for Tracy, California to the EPA. Each is listed above with its population served.
What contaminants are in Tracy's water?
The contaminants EPA monitoring detected in Tracy include Nitrate-Nitrite, Nitrate, Fluoride, TTHM, 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.