Is El Oso Wsc Tap Water Safe? Quality Report

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

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	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2020-10-01 → 2020-12-31
MCL	Health-based	Resolved	2020-10-01 → 2020-12-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	568 µg/L 44% of the EPA limit 1300 µg/L	110/124	SYR4	2013–2018
Bromoform	69.5 µg/L No EPA limit set	77/77	SYR4	2012–2019
Dibromochloromethane	48.3 µg/L No EPA limit set	77/77	SYR4	2012–2019
Bromodichloromethane	20 µg/L No EPA limit set	76/77	SYR4	2012–2019
Chloroform	5.5 µg/L No EPA limit set	65/77	SYR4	2012–2019
TTHM	113 µg/L 141% of the EPA limit, in the worst sample — 80 µg/L	64/64	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	27 µg/L 45% of the EPA limit 60 µg/L	64/64	SYR4	2012–2019
Dibromoacetic Acid	14.3 µg/L No EPA limit set	62/64	SYR4	2012–2019
Dichloroacetic Acid	8.3 µg/L No EPA limit set	61/64	SYR4	2012–2019
Monobromoacetic Acid	6.7 µg/L No EPA limit set	46/64	SYR4	2012–2019
Trichloroacetic Acid	3.7 µg/L No EPA limit set	41/64	SYR4	2012–2019
Lead	12.4 µg/L 83% of the EPA limit 15 µg/L	32/124	SYR4	2013–2018
Nitrate	3630 µg/L 36% of the EPA limit 10000 µg/L	30/32	SYR4	2012–2019
Arsenic	14.2 µg/L 142% of the EPA limit, in the worst sample — 10 µg/L	25/33	SYR4	2012–2019
Lead	0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L	17/17	LCR	2023
Nitrate-Nitrite	2930 µg/L 29% of the EPA limit 10000 µg/L	5/6	SYR4	2012–2015
Barium	76 µg/L 3.8% of the EPA limit 2000 µg/L	4/4	SYR4	2014–2017
Fluoride	1000 µg/L 25% of the EPA limit 4000 µg/L	4/4	SYR4	2014–2017
Lithium	76.5 µg/L No EPA limit set	4/4	UCMR-5	2024
Gross Beta Particle Activity	10.3 pCi/L No EPA limit set	2/2	SYR4	2016
Monochloroacetic Acid	7.7 µg/L No EPA limit set	2/64	SYR4	2012–2019
Selenium	3.5 µg/L 7% of the EPA limit 50 µg/L	2/4	SYR4	2014–2017
Combined Uranium	5.2 µg/L 17% of the EPA limit 30 µg/L	1/2	SYR4	2016
Gross Alpha, Excl. Radon And U	2 pCi/L 13% of the EPA limit 15 pCi/L	1/2	SYR4	2016
Styrene	0.5000 µg/L 0.5% of the EPA limit 100 µg/L	1/13	SYR4	2014–2019
Xylenes, Total	0.5000 µg/L 0% of the EPA limit 10000 µg/L	1/13	SYR4	2014–2019

83 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: JENDRUSCH, GERALD
Phone: 830-583-3543

Frequently asked questions about El Oso Wsc

Is El Oso Wsc tap water safe to drink?

EPA monitoring detected 26 contaminants in El Oso Wsc'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 El Oso Wsc's water?

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

How many people does El Oso Wsc serve?

El Oso Wsc reports serving 6,288 people in Texas, per its EPA record.

Has El Oso Wsc had any water quality violations?

The EPA has 80 violations on file for El Oso Wsc, of which 68 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.