What was found in Yucaipa'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 | 594999.9999999998 µg/L 5950% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Nitrate | 9000 µg/L 90% of the EPA limit 10000 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Fluoride | 891.4999999999999 µg/L 22% of the EPA limit 4000 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 4/4 | SYR4 |
| Copper | 274.49999999999994 µg/L 21% of the EPA limit 1300 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Barium | 118.5 µg/L 5.9% of the EPA limit 2000 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| TTHM | 90.08499999999998 µg/L 113% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Bromoform | 37.404999999999994 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 34.655 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Chloroform | 27.65 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019
Highest in the city: 33.76 µg/L — WESTERN HEIGHTS WATER COMPANY · 7,705 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25.15 µg/L 42% of the EPA limit 60 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 3/4 | SYR4 |
| Bromodichloromethane | 22.009999999999998 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019
Highest in the city: 23.75 µg/L — WESTERN HEIGHTS WATER COMPANY · 7,705 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 12.95 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Dichloroacetic Acid | 12.549999999999997 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 12.5 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 2/4 | SYR4 |
| Arsenic | 9.95 µg/L 99% of the EPA limit 10 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Lead | 8.2 µg/L 55% of the EPA limit 15 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Selenium | 5.5 µg/L 11% of the EPA limit 50 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 5.386349999999998 µg/L 18% of the EPA limit 30 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2017 | 2/4 | SYR4 |
| Monochloroacetic Acid | 2.7 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019
Highest in the city: 3.6 µg/L — CDF - OAK GLEN CONSERVATION CAMP · 83 people · 2019 | 2/4 | SYR4 |
| Chromium | 2.4 µg/L 2.4% of the EPA limit 100 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.2699999999999998 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| 1,1-Dichloroethylene | 1.17 µg/L 17% of the EPA limit 7 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| 1,1,1-Trichloroethane | 0.6045 µg/L 0.3% of the EPA limit 200 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| Tetrachloroethylene | 0.6000 µg/L 12% of the EPA limit 5 µg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2019 | 1/4 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0364 µg/L 18% of the EPA limit 0.2000 µg/L Highest in the city: WESTERN HEIGHTS WATER COMPANY · 7,705 people · 2019 | 1/4 | SYR4 |
| PFBS | 0.0100 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2024 | 1/4 | UCMR-5 |
| Pfpea | 0.0089 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2024 | 1/4 | UCMR-5 |
| Pfhxa | 0.0071 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2024 | 1/4 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2023
Highest in the city: 0.0068 mg/L — CDF - OAK GLEN CONSERVATION CAMP · 83 people · 2024 | 4/4 | LCR |
| PFOA | 0.0042 µg/L No EPA limit set Main supplier: YUCAIPA VALLEY WATER DISTRICT · 52,010 people · 2024 | 1/4 | UCMR-5 |
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 Yucaipa
| Supplier | Population served |
|---|---|
| YUCAIPA VALLEY WATER DISTRICT | 52,010 |
| WESTERN HEIGHTS WATER COMPANY | 7,705 |
| BIG PINE TRACT | 300 |
| CDF - OAK GLEN CONSERVATION CAMP | 83 |
Frequently asked questions about Yucaipa tap water
Is Yucaipa tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Yucaipa. 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 Yucaipa?
4 public water suppliers report drinking-water monitoring for Yucaipa, California to the EPA. Each is listed above with its population served.
What contaminants are in Yucaipa's water?
The contaminants EPA monitoring detected in Yucaipa include Nitrate-Nitrite, Nitrate, Fluoride, Copper, 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.