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Tap water quality report

San Luis City of

EPA monitoring tested this supplier for 106 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

106
contaminants tested
21
detected
39,705
people served
16
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Local government
Counties served
Yuma

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.

16
health-based violations
680
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-06-06
TT Health-based Resolved 2024-06-06
TT Health-based Resolved 2024-06-06
TT Health-based Resolved 2024-06-06
TT Health-based Unaddressed 2021-09-15
TT Health-based Unaddressed 2021-09-15
TT Health-based Resolved 2021-08-05
TT Health-based Resolved 2021-08-05
TT Health-based Resolved 2021-08-05
TT Health-based Resolved 2021-08-05

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
TTHM
81.585 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 102 µg/L
148/148 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
18.54 µg/L 31%
of the EPA limit 60 µg/L
worst single sample: 25.8 µg/L
140/148 SYR4 2012–2019
Copper
663.15 µg/L 51%
of the EPA limit 1300 µg/L
worst single sample: 1610 µg/L
90/90 SYR4 2012–2018
Nitrate
1037.5 µg/L 10%
of the EPA limit 10000 µg/L
worst single sample: 1210 µg/L
36/108 SYR4 2012–2019
Lead
4.733 µg/L 32%
of the EPA limit 15 µg/L
worst single sample: 8.27 µg/L
27/90 SYR4 2012–2018
Barium
120 µg/L 6%
of the EPA limit 2000 µg/L
 18/18 SYR4 2012–2018
Arsenic
2.2835 µg/L 23%
of the EPA limit 10 µg/L
worst single sample: 2.3 µg/L
12/18 SYR4 2012–2018
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2024
Thallium, Total
0.8005 µg/L 40%
of the EPA limit 2 µg/L
worst single sample: 0.8500 µg/L
12/18 SYR4 2012–2018
Lithium
103 µg/L
No EPA limit set
 12/12 UCMR-5 2025
Combined Radium (-226 And -228)
3.944 pCi/L 79%
of the EPA limit 5 pCi/L
worst single sample: 4.64 pCi/L
9/20 SYR4 2012–2018
Nitrate-Nitrite
188 µg/L 1.9%
of the EPA limit 10000 µg/L
 7/16 SYR4 2012–2015
Antimony, Total
0.2000 µg/L 3.3%
of the EPA limit 6 µg/L
 6/18 SYR4 2012–2018
Beryllium, Total
0.5300 µg/L 13%
of the EPA limit 4 µg/L
 6/18 SYR4 2012–2018
Di(2-ethylhexyl) Phthalate
13.7 µg/L 228%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
 6/44 SYR4 2012–2019
Fluoride
282.5 µg/L 7.1%
of the EPA limit 4000 µg/L
worst single sample: 290 µg/L
6/18 SYR4 2012–2018
Mercury
0.0700 µg/L 3.5%
of the EPA limit 2 µg/L
 6/18 SYR4 2012–2018
Selenium
5.2 µg/L 10%
of the EPA limit 50 µg/L
 6/18 SYR4 2012–2018
Gross Alpha, Excl. Radon And U
2.23 pCi/L 15%
of the EPA limit 15 pCi/L
worst single sample: 2.3 pCi/L
2/2 SYR4 2015
Dibromoacetic Acid
9.2 µg/L
No EPA limit set
 1/1 SYR4 2019
Dibromochloromethane
42.5 µg/L
No EPA limit set
 1/1 SYR4 2017
85 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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SAN LUIS CITY OF
Phone
928-341-8577
Email
[email protected]

Frequently asked questions about San Luis City of

Is San Luis City of tap water safe to drink?

EPA monitoring detected 21 contaminants in San Luis 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 San Luis City of's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Copper, Nitrate, Lead, and others. The full list with the level and data source for each is above.

How many people does San Luis City of serve?

San Luis City of reports serving 39,705 people in Arizona, per its EPA record.

Has San Luis City of had any water quality violations?

The EPA has 680 violations on file for San Luis City of, of which 16 are health-based (a contaminant limit or required treatment was breached) and 2 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.