What was found in South Gate'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 | 458000 µg/L 4580% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2013 | 1/1 | SYR4 |
| Nitrate | 2079.2 µg/L 21% of the EPA limit 10000 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Fluoride | 375.5 µg/L 9.4% of the EPA limit 4000 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Barium | 202 µg/L 10% of the EPA limit 2000 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 28.124 µg/L 47% of the EPA limit 60 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| TTHM | 10.868 µg/L 14% of the EPA limit 80 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 7.128 µg/L 143% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 5.68435 µg/L 19% of the EPA limit 30 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Bromoform | 5.545 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 4.905 µg/L 98% of the EPA limit 5 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 4.43 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 3.8 pCi/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2015 | 1/1 | SYR4 |
| Arsenic | 2.8 µg/L 28% of the EPA limit 10 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Copper | 2.7 µg/L 0.2% of the EPA limit 1300 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 2.05 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 1.714 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1.425 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.319 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Dichloromethane | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 1 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| 1,1-Dichloroethylene | 0.7350 µg/L 11% of the EPA limit 7 µg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| Chloroform | 0.2000 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0260 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| PFOA | 0.0100 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0063 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0061 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0060 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| PFBS | 0.0039 µg/L No EPA limit set Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SOUTH GATE-CITY, WATER DEPT. · 76,443 people · 2024 | 1/1 | 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 South Gate
| Supplier | Population served |
|---|---|
| SOUTH GATE-CITY, WATER DEPT. | 76,443 |
Frequently asked questions about South Gate tap water
Is South Gate tap water safe to drink?
EPA testing detected 31 contaminants in the water serving South Gate. 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 South Gate?
1 public water supplier report drinking-water monitoring for South Gate, California to the EPA. Each is listed above with its population served.
What contaminants are in South Gate's water?
The contaminants EPA monitoring detected in South Gate include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Total Haloacetic Acids (HAA5). 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.