Tap WaterIndex

← California

Tap water quality report

Rialto, City of

EPA monitoring tested this supplier for 112 contaminants and detected 42. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

112
contaminants tested
42
detected
54,453
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
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.

4
health-based violations
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1993-08-01 → 1993-08-31
MCL Health-based Resolved 1993-08-01 → 1993-08-31
MCL Health-based Resolved 1993-07-01 → 1993-07-31
MCL Health-based Resolved 1993-07-01 → 1993-07-31
MR Monitoring Resolved 2013-01-01 → 2013-12-31
MR Monitoring Resolved 2013-01-01 → 2013-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0057 µg/L 2/19 2024
PFBS 0.0046 µg/L 2/19 2024
Pfhxa 0.0170 µg/L 2/19 2024
PFHXS 0.0035 µg/L 2/19 2024
Pfpea 0.0180 µg/L 2/19 2024
Pfhpa 0.0035 µg/L 1/19 2024
PFOA 0.0073 µg/L 1/19 2024

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
9944 µg/L 99%
of the EPA limit 10000 µg/L
 2228/2238 SYR4 2012–2019
Trichloroethylene
10 µg/L 200%
of the EPA limit, in the worst sample — 5 µg/L
 453/873 SYR4 2012–2019
1,2-Dichloropropane
1.2 µg/L 24%
of the EPA limit 5 µg/L
 219/843 SYR4 2012–2019
Tetrachloroethylene
1.5 µg/L 30%
of the EPA limit 5 µg/L
 171/843 SYR4 2012–2019
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 80/80 SYR4 2012–2019
TTHM
35 µg/L 44%
of the EPA limit 80 µg/L
 74/509 SYR4 2012–2019
Chloroform
7.7 µg/L
No EPA limit set
 68/509 SYR4 2012–2019
Dibromochloromethane
12 µg/L
No EPA limit set
 67/509 SYR4 2012–2019
Bromodichloromethane
10 µg/L
No EPA limit set
 59/509 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 28/28 LCR 2024
Total Haloacetic Acids (HAA5)
16 µg/L 27%
of the EPA limit 60 µg/L
 25/92 SYR4 2012–2019
Bromoform
4.4 µg/L
No EPA limit set
 24/509 SYR4 2012–2019
Arsenic
17 µg/L 170%
of the EPA limit, in the worst sample — 10 µg/L
 17/55 SYR4 2012–2019
Monochloroacetic Acid
14 µg/L
No EPA limit set
 17/92 SYR4 2012–2019
Combined Uranium
6.7944 µg/L 23%
of the EPA limit 30 µg/L
 16/16 SYR4 2014–2019
Dichloroacetic Acid
3.8 µg/L
No EPA limit set
 14/92 SYR4 2012–2019
Chromium
3.4 µg/L 3.4%
of the EPA limit 100 µg/L
 9/25 SYR4 2012–2019
Gross Beta Particle Activity
1.82 pCi/L
No EPA limit set
 9/12 SYR4 2013–2016
Barium
55 µg/L 2.8%
of the EPA limit 2000 µg/L
 7/25 SYR4 2012–2019
Dibromoacetic Acid
2.6 µg/L
No EPA limit set
 7/92 SYR4 2012–2019
1,1-Dichloroethylene
0.6400 µg/L 9.1%
of the EPA limit 7 µg/L
 6/843 SYR4 2012–2019
Toluene
57 µg/L 5.7%
of the EPA limit 1000 µg/L
 5/842 SYR4 2012–2019
Trichloroacetic Acid
2.2 µg/L
No EPA limit set
 5/92 SYR4 2012–2019
Styrene
3.7 µg/L 3.7%
of the EPA limit 100 µg/L
 4/843 SYR4 2012–2019
1,1,2-Trichloroethane
0.5800 µg/L 12%
of the EPA limit 5 µg/L
 3/843 SYR4 2012–2019
Ethylbenzene
1.3 µg/L 0.2%
of the EPA limit 700 µg/L
 3/842 SYR4 2012–2019
Monobromoacetic Acid
1.7 µg/L
No EPA limit set
 3/92 SYR4 2012–2019
1,2,4-Trichlorobenzene
0.5600 µg/L 0.8%
of the EPA limit 70 µg/L
 2/843 SYR4 2012–2019
1,2-Dichloroethane
0.8000 µg/L 16%
of the EPA limit 5 µg/L
 2/843 SYR4 2012–2019
Dichloromethane
3.1 µg/L 62%
of the EPA limit 5 µg/L
 2/840 SYR4 2012–2019
Nitrate-Nitrite
3300 µg/L 33%
of the EPA limit 10000 µg/L
 2/2 SYR4 2016–2019
Xylenes, Total
2 µg/L 0%
of the EPA limit 10000 µg/L
 2/840 SYR4 2012–2019
1,2-DIBROMO-3-CHLOROPROPANE
0.0220 µg/L 11%
of the EPA limit 0.2000 µg/L
 1/23 SYR4 2013–2019
Copper
140 µg/L 11%
of the EPA limit 1300 µg/L
 1/72 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
11 µg/L 183%
of the EPA limit, in the worst sample — 6 µg/L
 1/14 SYR4 2014–2019
70 contaminants tested, none detected
1,1,1-Trichloroethane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SEBBAG, TOYASHA
Phone
909-820-2525
Email
tsebbag@rialtoca.gov

Frequently asked questions about Rialto, City of

Is Rialto, City of tap water safe to drink?

EPA monitoring detected 42 contaminants in Rialto, 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 Rialto, City of's water?

EPA monitoring detected Nitrate, Trichloroethylene, 1,2-Dichloropropane, Tetrachloroethylene, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Rialto, City of serve?

Rialto, City of reports serving 54,453 people in California, per its EPA record.

Has Rialto, City of had any water quality violations?

The EPA has 6 violations on file for Rialto, City of, of which 4 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.