What was found in Fairfield'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 FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Nitrate | 1511.94 µg/L 15% of the EPA limit 10000 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 2/2 | SYR4 |
| Fluoride | 965 µg/L 24% of the EPA limit 4000 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 2/2 | SYR4 |
| Chromium | 131.75 µg/L 132% of the EPA limit, at the 95th percentile of samples — 100 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 2/2 | SYR4 |
| Copper | 101.9 µg/L 7.8% of the EPA limit 1300 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 2/2 | SYR4 |
| TTHM | 59.45 µg/L 74% of the EPA limit 80 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Chloroform | 47 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Lead | 28.215 µg/L 188% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Nitrite | 23 µg/L 2.3% of the EPA limit 1000 µg/L Highest in the city: CRESTA MESA PARQUE · 25 people · 2019 | 1/2 | SYR4 |
| Arsenic | 3.995 µg/L 40% of the EPA limit 10 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019
Highest in the city: 20 µg/L — CRESTA MESA PARQUE · 25 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20 µg/L 33% of the EPA limit 60 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 11.65 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Barium | 9.742 µg/L 0.5% of the EPA limit 2000 µg/L Highest in the city: CRESTA MESA PARQUE · 25 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 8.87 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 4.49 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 4.1 pCi/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2018 | 1/2 | SYR4 |
| Combined Uranium | 2.831 µg/L 9.4% of the EPA limit 30 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Cadmium | 2.24 µg/L 45% of the EPA limit 5 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 2.19 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Bromate | 1.98 µg/L 20% of the EPA limit 10 µg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.38 µg/L No EPA limit set Main supplier: CITY OF FAIRFIELD · 120,377 people · 2019 | 1/2 | SYR4 |
| Mercury | 0.4400 µg/L 22% of the EPA limit 2 µg/L Highest in the city: CRESTA MESA PARQUE · 25 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF FAIRFIELD · 120,377 people · 2023
Highest in the city: 0.0028 mg/L — CRESTA MESA PARQUE · 25 people · 2025 | 2/2 | 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 Fairfield
| Supplier | Population served |
|---|---|
| CITY OF FAIRFIELD | 120,377 |
| CRESTA MESA PARQUE | 25 |
Frequently asked questions about Fairfield tap water
Is Fairfield tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Fairfield. 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 Fairfield?
2 public water suppliers report drinking-water monitoring for Fairfield, California to the EPA. Each is listed above with its population served.
What contaminants are in Fairfield's water?
The contaminants EPA monitoring detected in Fairfield include Nitrate-Nitrite, Nitrate, Fluoride, Chromium, 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.