What was found in Blythe'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 |
|---|---|---|---|
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019
Highest in the city: 8900 µg/L — CHUCKAWALLA VALLEY STATE PRISON · 4,090 people · 2019 | 5/5 | SYR4 |
| Nitrate | 1200 µg/L 12% of the EPA limit 10000 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019
Highest in the city: 3580 µg/L — CHUCKAWALLA VALLEY STATE PRISON · 4,090 people · 2019 | 4/5 | SYR4 |
| Lithium | 87.7 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2024
Highest in the city: 159 µg/L — RIVERSIDE CSA #122-MESA VERDE · 766 people · 2025 | 3/5 | UCMR-5 |
| TTHM | 68 µg/L 85% of the EPA limit 80 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 5/5 | SYR4 |
| Monochloroacetic Acid | 66.4 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 1/5 | SYR4 |
| Barium | 65 µg/L 3.3% of the EPA limit 2000 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 55.1 µg/L 92% of the EPA limit 60 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 3/5 | SYR4 |
| Arsenic | 47 µg/L 470% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: CHUCKAWALLA VALLEY STATE PRISON · 4,090 people · 2019 | 3/5 | SYR4 |
| Bromoform | 6.26 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019
Highest in the city: 26.755 µg/L — BLYTHE - MESA RANCH · 558 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 25 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 5/5 | SYR4 |
| Selenium | 22.58 µg/L 45% of the EPA limit 50 µg/L Highest in the city: RIVERSIDE CSA #122-MESA VERDE · 766 people · 2017 | 1/5 | SYR4 |
| Dibromochloromethane | 21.65 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 5/5 | SYR4 |
| Chloroform | 19.65 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019
Highest in the city: 11.3389 µg/L — BLYTHE - MESA RANCH · 558 people · 2019 | 3/5 | SYR4 |
| Dichloroacetic Acid | 7.4 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 3/5 | SYR4 |
| Chromium | 7.275 µg/L 7.3% of the EPA limit 100 µg/L Highest in the city: RIVERSIDE CSA #122-MESA VERDE · 766 people · 2017 | 2/5 | SYR4 |
| Monobromoacetic Acid | 6.82 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 6.575 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 5.485 µg/L No EPA limit set Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 3/5 | SYR4 |
| Gross Beta Particle Activity | 4 pCi/L No EPA limit set Highest in the city: RIVERSIDE CSA #122-MESA VERDE · 766 people · 2017 | 1/5 | SYR4 |
| Thallium, Total | 1.1 µg/L 55% of the EPA limit 2 µg/L Highest in the city: CHUCKAWALLA VALLEY STATE PRISON · 4,090 people · 2018 | 1/5 | SYR4 |
| 1,2-Dichloropropane | 0.5500 µg/L 11% of the EPA limit 5 µg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2019 | 1/5 | SYR4 |
| Lead | 0.0055 mg/L 37% of the EPA limit 0.0150 mg/L Main supplier: BLYTHE - CITY OF · 9,798 people · 2025 | 5/5 | 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 Blythe
| Supplier | Population served |
|---|---|
| BLYTHE - CITY OF | 9,798 |
| CHUCKAWALLA VALLEY STATE PRISON | 4,090 |
| RIVERSIDE CSA #122-MESA VERDE | 766 |
| BLYTHE - MESA RANCH | 558 |
| BLYTHE - HIDDEN BEACHES | 393 |
Frequently asked questions about Blythe tap water
Is Blythe tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Blythe. 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 Blythe?
5 public water suppliers report drinking-water monitoring for Blythe, California to the EPA. Each is listed above with its population served.
What contaminants are in Blythe's water?
The contaminants EPA monitoring detected in Blythe include Fluoride, Nitrate, Lithium, TTHM, Monochloroacetic Acid. 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.