Compliance record
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 | 7406.02 µg/L 74% of the EPA limit 10000 µg/L
worst single sample: 7975.54 µg/L | 978/1024 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 104200 µg/L 1042% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 1000000 µg/L | 96/109 | SYR4 | 2012–2019 |
| Arsenic | 20.1 µg/L 201% of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 83 µg/L | 32/862 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 28/28 | LCR | 2025 |
| Combined Uranium | 12.0541 µg/L 40% of the EPA limit 30 µg/L
worst single sample: 13.112 µg/L | 22/41 | SYR4 | 2012–2018 |
| Barium | 200 µg/L 10% of the EPA limit 2000 µg/L | 21/163 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0300 µg/L 15% of the EPA limit 0.2000 µg/L | 19/215 | SYR4 | 2012–2019 |
| Trichloroethylene | 0.6000 µg/L 12% of the EPA limit 5 µg/L | 18/903 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 0.9400 µg/L 19% of the EPA limit 5 µg/L
worst single sample: 1 µg/L | 13/903 | SYR4 | 2012–2019 |
| Lead | 13 µg/L 87% of the EPA limit 15 µg/L
worst single sample: 14 µg/L | 11/163 | SYR4 | 2012–2019 |
| Fluoride | 1084.5 µg/L 27% of the EPA limit 4000 µg/L
worst single sample: 1130 µg/L | 8/261 | SYR4 | 2012–2019 |
| Copper | 271.6 µg/L 21% of the EPA limit 1300 µg/L
worst single sample: 304 µg/L | 4/158 | SYR4 | 2012–2019 |
| Antimony, Total | 0.7325 µg/L 12% of the EPA limit 6 µg/L
worst single sample: 0.7500 µg/L | 2/163 | SYR4 | 2012–2019 |
| Chromium | 8.77 µg/L 8.8% of the EPA limit 100 µg/L
worst single sample: 9 µg/L | 2/189 | SYR4 | 2012–2019 |
| Selenium | 6 µg/L 12% of the EPA limit 50 µg/L | 1/163 | SYR4 | 2012–2019 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTTHMThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Cal Am - Suburban Rosemont
Is Cal Am - Suburban Rosemont tap water safe to drink?
EPA monitoring detected 22 contaminants in Cal Am - Suburban Rosemont'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 Cal Am - Suburban Rosemont's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Arsenic, Lead, Combined Uranium, and others. The full list with the level and data source for each is above.
How many people does Cal Am - Suburban Rosemont serve?
Cal Am - Suburban Rosemont reports serving 54,793 people in California, per its EPA record.
Has Cal Am - Suburban Rosemont had any water quality violations?
The EPA has no formal drinking-water violations on file for Cal Am - Suburban Rosemont.
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.