Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
1
health-based violations
1
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Archived | 1981-06-01 → 1981-06-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 10170 µg/L 102% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 17000 µg/L | 8840/8850 | SYR4 | 2012–2019 |
| Combined Uranium | 41.72 µg/L 139% of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 77.48 µg/L | 3299/3342 | SYR4 | 2012–2019 |
| TTHM | 5.6 µg/L 7% of the EPA limit 80 µg/L
worst single sample: 36 µg/L | 1288/1662 | SYR4 | 2012–2019 |
| Fluoride | 750 µg/L 19% of the EPA limit 4000 µg/L
worst single sample: 1300 µg/L | 801/801 | SYR4 | 2012–2019 |
| Arsenic | 8 µg/L 80% of the EPA limit 10 µg/L
worst single sample: 20 µg/L | 688/1267 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.2900 µg/L 145% of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
worst single sample: 0.5700 µg/L | 607/3849 | SYR4 | 2012–2019 |
| Bromoform | 2.9 µg/L No EPA limit set
worst single sample: 9.7 µg/L | 572/1517 | SYR4 | 2012–2019 |
| Dibromochloromethane | 2.9 µg/L No EPA limit set
worst single sample: 7.6 µg/L | 572/1536 | SYR4 | 2012–2019 |
| Trichloroethylene | 11 µg/L 220% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 27 µg/L | 550/3279 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 359550 µg/L 3596% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 1000000 µg/L | 184/185 | SYR4 | 2013–2018 |
| Bromodichloromethane | 1.97 µg/L No EPA limit set
worst single sample: 16 µg/L | 87/1390 | SYR4 | 2012–2019 |
| 1,1-Dichloroethylene | 2.3 µg/L 33% of the EPA limit 7 µg/L
worst single sample: 2.7 µg/L | 86/2881 | SYR4 | 2012–2019 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L | 60/60 | LCR | 2025 |
| Gross Beta Particle Activity | 13 pCi/L No EPA limit set
worst single sample: 15 pCi/L | 41/47 | SYR4 | 2012–2019 |
| Chromium | 10.55 µg/L 11% of the EPA limit 100 µg/L
worst single sample: 14 µg/L | 30/1206 | SYR4 | 2012–2019 |
| Barium | 65 µg/L 3.3% of the EPA limit 2000 µg/L
worst single sample: 70 µg/L | 29/799 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 1.0915 µg/L 22% of the EPA limit 5 µg/L
worst single sample: 1.2 µg/L | 22/3248 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set | 20/404 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 4.005 pCi/L 80% of the EPA limit 5 pCi/L
worst single sample: 4.5 pCi/L | 10/30 | SYR4 | 2014–2019 |
| Dichloromethane | 1.905 µg/L 38% of the EPA limit 5 µg/L
worst single sample: 2.4 µg/L | 10/2881 | SYR4 | 2012–2019 |
| Chloroform | 9.732 µg/L No EPA limit set
worst single sample: 12 µg/L | 5/1355 | SYR4 | 2012–2019 |
| Picloram | 4.95 µg/L 1% of the EPA limit 500 µg/L
worst single sample: 5.1 µg/L | 3/335 | SYR4 | 2012–2019 |
| Copper | 135.75 µg/L 10% of the EPA limit 1300 µg/L
worst single sample: 140 µg/L | 2/614 | SYR4 | 2012–2019 |
| Lead | 8.355 µg/L 56% of the EPA limit 15 µg/L
worst single sample: 8.5 µg/L | 2/793 | SYR4 | 2012–2019 |
| Lithium | 9.1 µg/L No EPA limit set | 2/4 | UCMR-5 | 2023 |
87 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromateChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloriteDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPfpesPftaPftrdaPfunaPentachlorophenolSeleniumSimazineStyreneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Riverside, City of
Is Riverside, City of tap water safe to drink?
EPA monitoring detected 28 contaminants in Riverside, City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Riverside, City of's water?
EPA monitoring detected Nitrate, Combined Uranium, TTHM, Fluoride, Arsenic, and others. The full list with the level and data source for each is above.
How many people does Riverside, City of serve?
Riverside, City of reports serving 298,398 people in California, per its EPA record.
Has Riverside, City of had any water quality violations?
The EPA has 1 violation on file for Riverside, City of, of which 1 is health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
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.