What was found in Visalia'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 | 2938 µg/L 29% of the EPA limit 10000 µg/L Main supplier: LINNELL FARM LABOR CENTER · 694 people · 2019
Highest in the city: 13826.7 µg/L — EAST OROSI COMMUNITY SERVICES DISTRICT · 423 people · 2019 | 12/12 | SYR4 |
| Nitrate-Nitrite | 2060 µg/L 21% of the EPA limit 10000 µg/L Main supplier: LINNELL FARM LABOR CENTER · 694 people · 2017
Highest in the city: 11840 µg/L — EAST OROSI COMMUNITY SERVICES DISTRICT · 423 people · 2019 | 9/12 | SYR4 |
| Fluoride | 285 µg/L 7.1% of the EPA limit 4000 µg/L Highest in the city: EAST OROSI COMMUNITY SERVICES DISTRICT · 423 people · 2019 | 7/12 | SYR4 |
| Barium | 158 µg/L 7.9% of the EPA limit 2000 µg/L Highest in the city: WOODVILLE FARM LABOR CENTER · 650 people · 2018 | 9/12 | SYR4 |
| Copper | 100 µg/L 7.7% of the EPA limit 1300 µg/L Highest in the city: YOKOHL MUTUAL WATER CO · 95 people · 2019 | 2/12 | SYR4 |
| TTHM | 27.9 µg/L 35% of the EPA limit 80 µg/L Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 4/12 | SYR4 |
| Bromoform | 12.62 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 3/12 | SYR4 |
| Dibromochloromethane | 9.57 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 3/12 | SYR4 |
| Lead | 9.1 µg/L 61% of the EPA limit 15 µg/L Highest in the city: YETTEM WATER SYSTEM · 350 people · 2017 | 3/12 | SYR4 |
| Combined Uranium | 8.63902 µg/L 29% of the EPA limit 30 µg/L Highest in the city: MOUNTAIN VIEW MHP · 44 people · 2018 | 2/12 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.16 µg/L 8.6% of the EPA limit 60 µg/L Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 1/12 | SYR4 |
| Bromodichloromethane | 3.66 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 1/12 | SYR4 |
| Dibromoacetic Acid | 3.65 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 1/12 | SYR4 |
| Arsenic | 3.45 µg/L 35% of the EPA limit 10 µg/L Highest in the city: DELFT COLONY WATER · 412 people · 2018 | 8/12 | SYR4 |
| Chromium | 3.43 µg/L 3.4% of the EPA limit 100 µg/L Highest in the city: DELFT COLONY WATER · 412 people · 2018 | 6/12 | SYR4 |
| Toluene | 3 µg/L 0.3% of the EPA limit 1000 µg/L Highest in the city: SEVILLE WATER COMPANY · 691 people · 2018 | 2/12 | SYR4 |
| Monobromoacetic Acid | 1.94 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 1/12 | SYR4 |
| Chloroform | 1.17 µg/L No EPA limit set Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 1/12 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the city: SEVILLE WATER COMPANY · 691 people · 2017 | 2/12 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0650 µg/L 33% of the EPA limit 0.2000 µg/L Highest in the city: EAST OROSI COMMUNITY SERVICES DISTRICT · 423 people · 2019 | 1/12 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LINNELL FARM LABOR CENTER · 694 people · 2023
Highest in the city: 0.0020 mg/L — DELFT COLONY WATER · 412 people · 2025 | 12/12 | 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 Visalia
| Supplier | Population served |
|---|---|
| LINNELL FARM LABOR CENTER | 694 |
| SEVILLE WATER COMPANY | 691 |
| WOODVILLE FARM LABOR CENTER | 650 |
| PATTERSON TRACT CSD | 550 |
| THE LAKES ASSOCIATION | 495 |
| EAST OROSI COMMUNITY SERVICES DISTRICT | 423 |
| DELFT COLONY WATER | 412 |
| YETTEM WATER SYSTEM | 350 |
| BEDEL MUTUAL WATER COMPANY | 155 |
| SUNRISE MUTUAL WATER CO. | 109 |
| YOKOHL MUTUAL WATER CO | 95 |
| MOUNTAIN VIEW MHP | 44 |
Frequently asked questions about Visalia tap water
Is Visalia tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Visalia. 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 Visalia?
12 public water suppliers report drinking-water monitoring for Visalia, California to the EPA. Each is listed above with its population served.
What contaminants are in Visalia's water?
The contaminants EPA monitoring detected in Visalia include Nitrate, Nitrate-Nitrite, 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.