What was found in Arcadia'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 | 11500 µg/L 115% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2017 | 1/2 | SYR4 |
| Nitrate | 9040 µg/L 90% of the EPA limit 10000 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1200 µg/L 30% of the EPA limit 4000 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 2/2 | SYR4 |
| Barium | 140 µg/L 7% of the EPA limit 2000 µg/L Highest in the city: BLUE SKIES TRAILER PARK · 56 people · 2019 | 1/2 | SYR4 |
| Copper | 76 µg/L 5.8% of the EPA limit 1300 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2018 | 1/2 | SYR4 |
| Chromium | 19.75 µg/L 20% of the EPA limit 100 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| TTHM | 18 µg/L 23% of the EPA limit 80 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Lead | 15 µg/L 100% of the EPA limit 15 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2018 | 1/2 | SYR4 |
| Combined Uranium | 8.493 µg/L 28% of the EPA limit 30 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019
Highest in the city: 8.94 µg/L — BLUE SKIES TRAILER PARK · 56 people · 2015 | 2/2 | SYR4 |
| Bromoform | 6.9 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 6.875 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 6.6 µg/L 110% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2018 | 1/2 | SYR4 |
| Tetrachloroethylene | 6.3 µg/L 126% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Arsenic | 5.685 µg/L 57% of the EPA limit 10 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 4.3 µg/L 86% of the EPA limit 5 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 3.3 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.6 µg/L 4.3% of the EPA limit 60 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.5 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 2.3 pCi/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2018 | 1/2 | SYR4 |
| Chloroform | 1.8 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 1.285 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 0.6925 µg/L 9.9% of the EPA limit 7 µg/L Main supplier: CITY OF ARCADIA · 51,361 people · 2019 | 1/2 | SYR4 |
| PFOS | 0.0100 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0048 µg/L No EPA limit set Main supplier: CITY OF ARCADIA · 51,361 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0019 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: CITY OF ARCADIA · 51,361 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 Arcadia
| Supplier | Population served |
|---|---|
| CITY OF ARCADIA | 51,361 |
| BLUE SKIES TRAILER PARK | 56 |
Frequently asked questions about Arcadia tap water
Is Arcadia tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Arcadia. 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 Arcadia?
2 public water suppliers report drinking-water monitoring for Arcadia, California to the EPA. Each is listed above with its population served.
What contaminants are in Arcadia's water?
The contaminants EPA monitoring detected in Arcadia include Nitrate-Nitrite, Nitrate, 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.