Is Weslaco, TX Tap Water Safe? Quality & Contaminants

What was found in Weslaco's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Chlorite	1340 µg/L 134% of the EPA limit, in the worst sample — 1000 µg/L	1/2	SYR4
Copper	1190 µg/L 92% of the EPA limit 1300 µg/L	2/2	SYR4
Fluoride	560 µg/L 14% of the EPA limit 4000 µg/L	1/2	SYR4
Nitrate	510 µg/L 5.1% of the EPA limit 10000 µg/L	1/2	SYR4
Cyanide	150 µg/L 75% of the EPA limit 200 µg/L	1/2	SYR4
Barium	116 µg/L 5.8% of the EPA limit 2000 µg/L	1/2	SYR4
TTHM	105 µg/L 131% of the EPA limit, in the worst sample — 80 µg/L	2/2	SYR4
Bromoform	42.4 µg/L No EPA limit set	2/2	SYR4
Dibromochloromethane	36.6 µg/L No EPA limit set	2/2	SYR4
Lithium	36.1 µg/L No EPA limit set	1/2	UCMR-5
Lead	35 µg/L 233% of the EPA limit, in the worst sample — 15 µg/L	2/2	SYR4
Total Haloacetic Acids (HAA5)	34.9 µg/L 58% of the EPA limit 60 µg/L	2/2	SYR4
Dibromoacetic Acid	19.6 µg/L No EPA limit set	2/2	SYR4
Bromodichloromethane	18.7 µg/L No EPA limit set	2/2	SYR4
Dichloroacetic Acid	13.6 µg/L No EPA limit set	2/2	SYR4
Chloroform	11.4 µg/L No EPA limit set	2/2	SYR4
Trichloroacetic Acid	6.7 µg/L No EPA limit set	2/2	SYR4
Monochloroacetic Acid	6.6 µg/L No EPA limit set	2/2	SYR4
Gross Beta Particle Activity	5.2 pCi/L No EPA limit set	1/2	SYR4
Monobromoacetic Acid	4.7 µg/L No EPA limit set	2/2	SYR4
Selenium	4.4 µg/L 8.8% of the EPA limit 50 µg/L	1/2	SYR4
Arsenic	2.8 µg/L 28% of the EPA limit 10 µg/L	1/2	SYR4
Combined Uranium	1.3 µg/L 4.3% of the EPA limit 30 µg/L	1/2	SYR4
Atrazine	0.1000 µg/L 3.3% of the EPA limit 3 µg/L	1/2	SYR4
Pfhxa	0.0086 µg/L No EPA limit set	1/2	UCMR-5
Pfpea	0.0084 µg/L No EPA limit set	1/2	UCMR-5
Pfba	0.0076 µg/L No EPA limit set	1/2	UCMR-5
PFOS	0.0059 µg/L No EPA limit set	1/2	UCMR-5
PFHXS	0.0058 µg/L No EPA limit set	1/2	UCMR-5
Pfhpa	0.0036 µg/L No EPA limit set	1/2	UCMR-5
Lead	0.0015 mg/L 10% of the EPA limit 0.0150 mg/L	2/2	LCR

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. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Weslaco

Supplier	Population served
CITY OF WESLACO	40,033
TRAILS END MOBILE HOME PARK	200

Frequently asked questions about Weslaco tap water

Is Weslaco tap water safe to drink?

EPA testing detected 31 contaminants in the water serving Weslaco. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Weslaco?

2 public water suppliers report drinking-water monitoring for Weslaco, Texas to the EPA. Each is listed above with its population served.

What contaminants are in Weslaco's water?

The contaminants EPA monitoring detected in Weslaco include Chlorite, Copper, Fluoride, Nitrate, Cyanide. The full list, with the highest level found and the data source, is in the table above.

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.