Is Green Valley Sud Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Guadalupe

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

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2014-04-01 → 2014-04-30
MCL	Health-based	Resolved	2014-04-01 → 2014-04-30
MCL	Health-based	Resolved	2014-04-01 → 2014-04-30
MCL	Health-based	Resolved	2014-04-01 → 2014-04-30
Other	Monitoring	Resolved	2025-10-03
Other	Monitoring	Resolved	2025-10-03
Other	Monitoring	Resolved	2024-07-01
Other	Monitoring	Resolved	2024-07-01
MON	Monitoring	Resolved	2024-07-01 → 2024-07-31
MON	Monitoring	Resolved	2024-07-01 → 2024-07-31

PFAS detected

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

Contaminant	Max	Detection rate	Period
Pfpea	0.0049 µg/L	4/12	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 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	280 µg/L 22% of the EPA limit 1300 µg/L worst single sample: 760 µg/L	181/187	SYR4	2013–2019
Dibromochloromethane	8.67 µg/L No EPA limit set worst single sample: 20.3 µg/L	112/144	SYR4	2012–2019
TTHM	23.95 µg/L 30% of the EPA limit 80 µg/L worst single sample: 67.4 µg/L	106/129	SYR4	2012–2019
Bromodichloromethane	7.58 µg/L No EPA limit set worst single sample: 24.2 µg/L	95/144	SYR4	2012–2019
Bromoform	5.645 µg/L No EPA limit set worst single sample: 9.6 µg/L	94/144	SYR4	2012–2019
Nitrate	2190 µg/L 22% of the EPA limit 10000 µg/L worst single sample: 2340 µg/L	88/100	SYR4	2012–2019
Lead	6.385 µg/L 43% of the EPA limit 15 µg/L worst single sample: 19.3 µg/L	84/187	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	19.63 µg/L 33% of the EPA limit 60 µg/L worst single sample: 55 µg/L	64/129	SYR4	2012–2019
Chloroform	11.5 µg/L No EPA limit set worst single sample: 25.1 µg/L	57/144	SYR4	2012–2019
Dibromoacetic Acid	5.245 µg/L No EPA limit set worst single sample: 8.2 µg/L	52/129	SYR4	2012–2019
Dichloroacetic Acid	13.04 µg/L No EPA limit set worst single sample: 32.3 µg/L	45/129	SYR4	2012–2019
Nitrate-Nitrite	2082 µg/L 21% of the EPA limit 10000 µg/L worst single sample: 2120 µg/L	20/23	SYR4	2012–2015
Trichloroacetic Acid	4.855 µg/L No EPA limit set worst single sample: 9.7 µg/L	20/129	SYR4	2012–2019
Lead	0.0018 mg/L 12% of the EPA limit 0.0150 mg/L	16/16	LCR	2025
Barium	41.18 µg/L 2.1% of the EPA limit 2000 µg/L worst single sample: 41.9 µg/L	9/9	SYR4	2016–2019
Monochloroacetic Acid	7.445 µg/L No EPA limit set worst single sample: 8.6 µg/L	8/129	SYR4	2012–2019
Xylenes, Total	7.8 µg/L 0.1% of the EPA limit 10000 µg/L worst single sample: 9.2 µg/L	8/15	SYR4	2012–2019
Fluoride	729 µg/L 18% of the EPA limit 4000 µg/L worst single sample: 750 µg/L	7/7	SYR4	2013–2019
Monobromoacetic Acid	8.205 µg/L No EPA limit set worst single sample: 9 µg/L	4/129	SYR4	2012–2019
Ethylbenzene	1.16 µg/L 0.2% of the EPA limit 700 µg/L worst single sample: 1.2 µg/L	3/15	SYR4	2012–2019
Lithium	41 µg/L No EPA limit set	2/12	UCMR-5	2023
Di(2-ethylhexyl) Phthalate	0.9200 µg/L 15% of the EPA limit 6 µg/L	1/13	SYR4	2012–2019

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-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: FRIAS, JOHN
Phone: 210-279-3960
Email: [email protected]

Frequently asked questions about Green Valley Sud

Is Green Valley Sud tap water safe to drink?

EPA monitoring detected 23 contaminants in Green Valley Sud'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 Green Valley Sud's water?

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

How many people does Green Valley Sud serve?

Green Valley Sud reports serving 52,497 people in Texas, per its EPA record.

Has Green Valley Sud had any water quality violations?

The EPA has 62 violations on file for Green Valley Sud, 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.