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Tap water quality report

Colton, City of

EPA monitoring tested this supplier for 111 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
21
detected
46,525
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
San Bernardino

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.

0
health-based violations
2
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2022-01-01 → 2022-12-31
MR Monitoring Resolved 2022-01-01 → 2022-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0051 µg/L 5/15 2025
PFOS 0.0180 µg/L 5/15 2025
PFBS 0.0100 µg/L 3/15 2025
Pfhxa 0.0035 µg/L 2/15 2025
PFOA 0.0059 µg/L 2/15 2025
Pfpea 0.0045 µg/L 2/15 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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
7400 µg/L 74%
of the EPA limit 10000 µg/L
worst single sample: 7700 µg/L
370/418 SYR4 2012–2019
Fluoride
759 µg/L 19%
of the EPA limit 4000 µg/L
worst single sample: 1200 µg/L
95/95 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 32/32 LCR 2025
Dibromochloromethane
3.635 µg/L
No EPA limit set
worst single sample: 4.3 µg/L
20/24 SYR4 2013–2019
TTHM
9.6 µg/L 12%
of the EPA limit 80 µg/L
worst single sample: 11.5 µg/L
20/24 SYR4 2013–2019
Arsenic
5.99 µg/L 60%
of the EPA limit 10 µg/L
worst single sample: 6.5 µg/L
18/39 SYR4 2012–2019
Bromoform
3.74 µg/L
No EPA limit set
worst single sample: 5.5 µg/L
17/24 SYR4 2013–2019
Combined Uranium
12.6352 µg/L 42%
of the EPA limit 30 µg/L
worst single sample: 13.41 µg/L
14/14 SYR4 2013–2019
Bromodichloromethane
2.24 µg/L
No EPA limit set
worst single sample: 2.3 µg/L
13/24 SYR4 2013–2019
Nitrate-Nitrite
848000 µg/L 8480%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 890000 µg/L
13/20 SYR4 2014–2019
Chloroform
2.02 µg/L
No EPA limit set
worst single sample: 2.2 µg/L
10/24 SYR4 2013–2019
Dibromoacetic Acid
1.48 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
3/23 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
1.48 µg/L 2.5%
of the EPA limit 60 µg/L
worst single sample: 1.5 µg/L
3/23 SYR4 2013–2019
Monobromoacetic Acid
1.1 µg/L
No EPA limit set
 1/23 SYR4 2013–2019
cis-1,2-Dichloroethylene
0.7400 µg/L 1.1%
of the EPA limit 70 µg/L
 1/42 SYR4 2013–2019
90 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, TotalLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ALZAMMAR, BASSAM
Phone
909-370-6101
Email
[email protected]

Frequently asked questions about Colton, City of

Is Colton, City of tap water safe to drink?

EPA monitoring detected 21 contaminants in Colton, 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 Colton, City of's water?

EPA monitoring detected Nitrate, Fluoride, Lead, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does Colton, City of serve?

Colton, City of reports serving 46,525 people in California, per its EPA record.

Has Colton, City of had any water quality violations?

The EPA has 2 violations on file for Colton, City of, of which 0 are 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.