What was found in Avalon'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 | 4365 µg/L 44% of the EPA limit 10000 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Nitrate | 4185 µg/L 42% of the EPA limit 10000 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Fluoride | 794 µg/L 20% of the EPA limit 4000 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 375 pCi/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2016 | 1/1 | SYR4 |
| Barium | 221 µg/L 11% of the EPA limit 2000 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Copper | 140 µg/L 11% of the EPA limit 1300 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| TTHM | 117 µg/L 146% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Bromoform | 69.7 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Lithium | 52.9 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2024 | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 39.75 µg/L 66% of the EPA limit 60 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 35.8 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 32 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Chromium | 11 µg/L 11% of the EPA limit 100 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 10 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Arsenic | 5.625 µg/L 56% of the EPA limit 10 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 5.42 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 4.34 µg/L 87% of the EPA limit 5 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 3.874 µg/L 13% of the EPA limit 30 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 3.7 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Chloroform | 2.445 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 2.18 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 2 µg/L 40% of the EPA limit 5 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Toluene | 1.5655 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2019 | 1/1 | SYR4 |
| Pfhpa | 0.0070 µg/L No EPA limit set Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SO. CAL. EDISON CO.-SANTA CATALINA · 3,822 people · 2023 | 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 Avalon
| Supplier | Population served |
|---|---|
| SO. CAL. EDISON CO.-SANTA CATALINA | 3,822 |
Frequently asked questions about Avalon tap water
Is Avalon tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Avalon. 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 Avalon?
1 public water supplier report drinking-water monitoring for Avalon, California to the EPA. Each is listed above with its population served.
What contaminants are in Avalon's water?
The contaminants EPA monitoring detected in Avalon include Nitrate-Nitrite, Nitrate, Fluoride, Gross Beta Particle Activity, 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.