Is City of Leon Valley Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Bexar

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.

health-based violations

286

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2013-06-01 → 2013-06-30
MCL	Health-based	Resolved	2013-06-01 → 2013-06-30
MCL	Health-based	Resolved	2013-06-01 → 2013-06-30
MCL	Health-based	Resolved	2013-06-01 → 2013-06-30
RPT	Monitoring	Resolved	2025-07-02
RPT	Monitoring	Resolved	2025-07-02
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFBS	0.0031 µg/L	1/4	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 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
Copper	206.4 µg/L 16% of the EPA limit 1300 µg/L worst single sample: 303 µg/L	153/154	SYR4	2013–2018
Lead	3.446 µg/L 23% of the EPA limit 15 µg/L worst single sample: 32.1 µg/L	128/154	SYR4	2013–2018
Dibromochloromethane	4.575 µg/L No EPA limit set worst single sample: 7.8 µg/L	106/130	SYR4	2012–2019
Bromoform	3.6 µg/L No EPA limit set worst single sample: 6.3 µg/L	101/130	SYR4	2012–2019
Bromodichloromethane	2.88 µg/L No EPA limit set worst single sample: 9.5 µg/L	73/130	SYR4	2012–2019
TTHM	9.865 µg/L 12% of the EPA limit 80 µg/L worst single sample: 17.5 µg/L	64/67	SYR4	2012–2019
Dibromoacetic Acid	1.81 µg/L No EPA limit set worst single sample: 3.6 µg/L	50/67	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	1.81 µg/L 3% of the EPA limit 60 µg/L worst single sample: 4.8 µg/L	50/67	SYR4	2012–2019
Nitrate	2581.5 µg/L 26% of the EPA limit 10000 µg/L worst single sample: 2620 µg/L	32/32	SYR4	2012–2019
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	16/16	LCR	2024
Chloroform	5.85 µg/L No EPA limit set worst single sample: 6.2 µg/L	15/130	SYR4	2012–2019
Nitrate-Nitrite	2546.5 µg/L 25% of the EPA limit 10000 µg/L worst single sample: 2550 µg/L	8/8	SYR4	2012–2019
Xylenes, Total	35.025 µg/L 0.4% of the EPA limit 10000 µg/L worst single sample: 46 µg/L	6/63	SYR4	2012–2019
Barium	42.58 µg/L 2.1% of the EPA limit 2000 µg/L worst single sample: 42.8 µg/L	5/5	SYR4	2014–2019
Fluoride	210 µg/L 5.3% of the EPA limit 4000 µg/L	4/4	SYR4	2014–2017
Dichloromethane	1.085 µg/L 22% of the EPA limit 5 µg/L worst single sample: 1.1 µg/L	2/63	SYR4	2012–2019
Combined Radium (-226 And -228)	1.5 pCi/L 30% of the EPA limit 5 pCi/L	1/1	SYR4	2016
Dichloroacetic Acid	1.2 µg/L No EPA limit set	1/67	SYR4	2012–2019
Ethylbenzene	7.5 µg/L 1.1% of the EPA limit 700 µg/L	1/63	SYR4	2012–2019
Toluene	2.3 µg/L 0.2% of the EPA limit 1000 µg/L	1/63	SYR4	2012–2019

88 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RILEY, CHRIS
Phone: 210-684-1391
Email: [email protected]

Frequently asked questions about City of Leon Valley

Is City of Leon Valley tap water safe to drink?

EPA monitoring detected 21 contaminants in City of Leon Valley'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 City of Leon Valley's water?

EPA monitoring detected Copper, Lead, Dibromochloromethane, Bromoform, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does City of Leon Valley serve?

City of Leon Valley reports serving 7,794 people in Texas, per its EPA record.

Has City of Leon Valley had any water quality violations?

The EPA has 286 violations on file for City of Leon Valley, 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.