What was found in Vacaville'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 | 1000000 µg/L 10000% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 3/11 | SYR4 |
| Nitrate | 3751.6 µg/L 38% of the EPA limit 10000 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 5/11 | SYR4 |
| Fluoride | 885.75 µg/L 22% of the EPA limit 4000 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 9/11 | SYR4 |
| Copper | 104.2 µg/L 8% of the EPA limit 1300 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 200 µg/L — SID - QUAIL CANYON · 132 people · 2017 | 3/11 | SYR4 |
| Barium | 140 µg/L 7% of the EPA limit 2000 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 186 µg/L — VINEYARD RV PARK · 550 people · 2018 | 4/11 | SYR4 |
| TTHM | 61.45 µg/L 77% of the EPA limit 80 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 118.9 µg/L — CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 7/11 | SYR4 |
| Chromium | 112.1 µg/L 112% of the EPA limit, at the 95th percentile of samples — 100 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 2/11 | SYR4 |
| Chloroform | 52 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 71.92 µg/L — CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 7/11 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.5 µg/L 39% of the EPA limit 60 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 58.6 µg/L — SID - PLEASANT HILLS RANCH · 89 people · 2019 | 6/11 | SYR4 |
| Lithium | 45 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2025 | 2/11 | UCMR-5 |
| Lead | 40.36 µg/L 269% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 3/11 | SYR4 |
| Dichloroacetic Acid | 11.225 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 39.2 µg/L — SID - PLEASANT HILLS RANCH · 89 people · 2019 | 6/11 | SYR4 |
| Bromodichloromethane | 9.4 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 32.64 µg/L — CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 7/11 | SYR4 |
| Trichloroacetic Acid | 9.95 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 28.95 µg/L — SID - GIBSON CANYON · 535 people · 2019 | 6/11 | SYR4 |
| Arsenic | 8.05 µg/L 81% of the EPA limit 10 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 16 µg/L — RURAL NORTH VACAVILLE WATER DISTRICT · 1,313 people · 2019 | 7/11 | SYR4 |
| Combined Uranium | 2.831 µg/L 9.4% of the EPA limit 30 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 13.9613 µg/L — VINEYARD RV PARK · 550 people · 2018 | 3/11 | SYR4 |
| Dibromochloromethane | 4.3 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 13.2 µg/L — CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 7/11 | SYR4 |
| Selenium | 8.905 µg/L 18% of the EPA limit 50 µg/L Highest in the city: SID - ELMIRA · 290 people · 2017 | 2/11 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.8 µg/L 63% of the EPA limit 6 µg/L Highest in the city: SUISUN-SOLANO WATER AUTHORITY · 29,105 people · 2017 | 4/11 | SYR4 |
| Monochloroacetic Acid | 2.88 µg/L No EPA limit set Highest in the city: SID - GIBSON CANYON · 535 people · 2019 | 3/11 | SYR4 |
| Dibromoacetic Acid | 2.62 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2019
Highest in the city: 2.774 µg/L — CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 4/11 | SYR4 |
| Bromoform | 2.28 µg/L No EPA limit set Highest in the city: VINEYARD RV PARK · 550 people · 2019 | 2/11 | SYR4 |
| Cadmium | 2.24 µg/L 45% of the EPA limit 5 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2019 | 1/11 | SYR4 |
| Monobromoacetic Acid | 2.1 µg/L No EPA limit set Highest in the city: CALIFORNIA STATE PRISON - SOLANO · 5,100 people · 2019 | 1/11 | SYR4 |
| Bromate | 1.1 µg/L 11% of the EPA limit 10 µg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2017 | 1/11 | SYR4 |
| Trichloroethylene | 0.9700 µg/L 19% of the EPA limit 5 µg/L Highest in the city: SUISUN-SOLANO WATER AUTHORITY · 29,105 people · 2019 | 4/11 | SYR4 |
| Antimony, Total | 0.1348 µg/L 2.2% of the EPA limit 6 µg/L Highest in the city: RURAL NORTH VACAVILLE WATER DISTRICT · 1,313 people · 2019 | 1/11 | SYR4 |
| PFOS | 0.0100 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2025 | 1/11 | UCMR-5 |
| PFHXS | 0.0092 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2025 | 1/11 | UCMR-5 |
| PFOA | 0.0051 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2025 | 1/11 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Main supplier: CITY OF VACAVILLE · 99,650 people · 2025 | 1/11 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF VACAVILLE · 99,650 people · 2023
Highest in the city: 0.0031 mg/L — SID - QUAIL CANYON · 132 people · 2024 | 11/11 | LCR |
| Thallium, Total | 0.0030 µg/L 0.2% of the EPA limit 2 µg/L Highest in the city: RURAL NORTH VACAVILLE WATER DISTRICT · 1,313 people · 2019 | 1/11 | SYR4 |
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 Vacaville
| Supplier | Population served |
|---|---|
| CITY OF VACAVILLE | 99,650 |
| SUISUN-SOLANO WATER AUTHORITY | 29,105 |
| CALIFORNIA STATE PRISON - SOLANO | 5,100 |
| RURAL NORTH VACAVILLE WATER DISTRICT | 1,313 |
| VINEYARD RV PARK | 550 |
| SID - GIBSON CANYON | 535 |
| SID - ELMIRA | 290 |
| SID - QUAIL CANYON | 132 |
| SID - PLEASANT HILLS RANCH | 89 |
| SID - BLUE RIDGE OAKS | 63 |
| SID - PEABODY | 56 |
Frequently asked questions about Vacaville tap water
Is Vacaville tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Vacaville. 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 Vacaville?
11 public water suppliers report drinking-water monitoring for Vacaville, California to the EPA. Each is listed above with its population served.
What contaminants are in Vacaville's water?
The contaminants EPA monitoring detected in Vacaville include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. 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.