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Zapata Tap Water Quality Report
Zapata's water has 3 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
Other systems listed for Zapata with results above guidelines: ZAPATA COUNTY WCID HWY 16 EAST (3 above guidelines)
People Served
11,913
Health-based violations since 2020
1
ZAPATA COUNTY WATERWORKS SWTP. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
May 2026 · ZAPATA COUNTY WATERWORKS SWTP
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Zapata Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Zapata's water has 3 contaminants above EPA health-based guidelines (MCLGs).
ZAPATA COUNTY WATERWORKS SWTP, Zapata's water system, serves 11,913 people. 1 other system is listed for Zapata. Each system's results are listed under its own name, never added to ZAPATA COUNTY WATERWORKS SWTP's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for ZAPATA COUNTY WATERWORKS SWTP is from May 2026.
In EPA's 2023–2026 UCMR 5 testing, ZAPATA COUNTY WATERWORKS SWTP measured lithium at up to 30.9 µg/L, which EPA counts as above its health reference level of 10 µg/L. That level is a screening value EPA uses to decide what to study further, not a legal limit, and this result does not change this page's water-quality summary.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Texas
Zapata Water Service Areas
What these numbers actually mean for Zapata, TX
We read Zapata, TX’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 3 contaminants above EPA MCLGs, 7 contaminants with an EPA health goal detected in some samples (no level on file) and 1 health-based EPA violation that began after the latest compliance result on file
- 223 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Zapata's water
ZAPATA COUNTY WATERWORKS SWTP
PWSID TX2530002
ZAPATA COUNTY WATERWORKS SWTP reported 0.43 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
ZAPATA COUNTY WCID HWY 16 EAST
PWSID TX2530023
No fluoride level in our data for ZAPATA COUNTY WCID HWY 16 EAST. Your utility's annual water quality report (CCR) lists it.
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Recommended Water Filters for Zapata
Based on Zapata's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Verify Your Water Quality with Independent Testing
With 3 contaminants above EPA MCLGs, 7 contaminants with an EPA health goal detected in some samples (no level on file) and 1 health-based EPA violation that began after the latest compliance result on file, independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
With 3 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Zapata's water readings can explain
Utility-reported data for Zapata includes sulfate and a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Zapata, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Zapata? Public-water results do not apply to private wells. See Zapata County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Zapata
Zapata's tap water measures 9.7 grains per gallon (165.0 mg/L) — hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for 9.7 gpg water in Zapata — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Texas as a whole, read water softener cost in Texas — priced against the plumber wage published for the state.
Frequently Asked Questions About Zapata Tap Water
Zapata's water has 3 contaminants above EPA MCLGs. We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. EPA records a health-based violation for ZAPATA COUNTY WATERWORKS SWTP that began after its latest compliance result on file (Jun 2022): Maximum Contaminant Level Violation, E. coli (RTCR) (Revised Total Coliform Rule), which began on June 1, 2023. Every such result predates it; its later EPA UCMR 5 results (May 2026) screen for unregulated contaminants and cannot show the water met this standard, so this page does not call the water safe.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach ZAPATA COUNTY WATERWORKS SWTP. For a problem with your water now (discolored water, no water, low pressure, a leak), contact ZAPATA COUNTY WATERWORKS SWTP directly.
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