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Tap water quality report

South Mesa Wc

EPA monitoring tested this supplier for 111 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
17
detected
10,108
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Riverside

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
14
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-04-01 → 2014-06-30
MCL Health-based Resolved 2014-04-01 → 2014-06-30
MR Monitoring Resolved 2013-10-01
MR Monitoring Resolved 2013-10-01
MR Monitoring Resolved 2010-04-01 → 2010-12-31
MR Monitoring Resolved 2010-04-01 → 2010-12-31
MR Monitoring Resolved 2009-01-01 → 2009-12-31
MR Monitoring Resolved 2009-01-01 → 2009-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0068 µg/L 2/16 2023
Pfpea 0.0089 µg/L 2/16 2023
PFBS 0.0047 µg/L 1/16 2023
PFHXS 0.0035 µg/L 1/16 2023

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
10000 µg/L 100%
of the EPA limit 10000 µg/L
 414/414 SYR4 2012–2019
Fluoride
2300 µg/L 57%
of the EPA limit 4000 µg/L
 66/66 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 39/39 LCR 2025
Bromoform
8.5 µg/L
No EPA limit set
 36/36 SYR4 2014–2019
TTHM
11.3 µg/L 14%
of the EPA limit 80 µg/L
 36/36 SYR4 2014–2019
Dibromochloromethane
4.2 µg/L
No EPA limit set
 31/36 SYR4 2014–2019
Nitrate-Nitrite
9500 µg/L 95%
of the EPA limit 10000 µg/L
 16/16 SYR4 2016–2019
Bromodichloromethane
2.1 µg/L
No EPA limit set
 15/36 SYR4 2014–2019
Dibromoacetic Acid
2.9 µg/L
No EPA limit set
 8/36 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
2.9 µg/L 4.8%
of the EPA limit 60 µg/L
 8/36 SYR4 2014–2019
Arsenic
5.2 µg/L 52%
of the EPA limit 10 µg/L
 7/32 SYR4 2012–2019
Combined Uranium
1.937 µg/L 6.5%
of the EPA limit 30 µg/L
 1/10 SYR4 2013–2015
Thallium, Total
1.1 µg/L 55%
of the EPA limit 2 µg/L
 1/25 SYR4 2013–2019
94 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 TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ARMSTRONG, DAVID
Phone
909-795-2401
Email
darmstrong@southmesawater.com

Frequently asked questions about South Mesa Wc

Is South Mesa Wc tap water safe to drink?

EPA monitoring detected 17 contaminants in South Mesa Wc'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 South Mesa Wc's water?

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

How many people does South Mesa Wc serve?

South Mesa Wc reports serving 10,108 people in California, per its EPA record.

Has South Mesa Wc had any water quality violations?

The EPA has 14 violations on file for South Mesa Wc, 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.