Is Geronimo, TX tap water safe?
The short answer
2 of the 3 utilities serving Geronimo have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Texas’s records: City of Seguin and Springs Hill SUD.
City of Seguin, which serves the most people here, has 1 result above the legal limit, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Total trihalomethanes (TTHM) at 49.4 ppb, above the legal limit.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Geronimo’s ZIP codes, from EPA’s estimates.
- Open report
City of Seguin
Texas · serves 32,736 people · about 530 in Geronimo
1 result above the legal limit, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Total trihalomethanes (TTHM) at 49.4 ppb, above the legal limit.
3 health-based violations since 2016
- Open report
Springs Hill SUD
Texas · serves 35,541 people · about 520 in Geronimo
1 result above the legal limit, 1 result above EPA’s new limit, which takes effect in 2029, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Total trihalomethanes (TTHM) at 59.1 ppb, above the legal limit.
8 health-based violations since 2016
- Open report
Green Valley SUD
Texas · serves 52,497 people · under 100 in Geronimo
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 41 ppb, above EPA’s health benchmark.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Seguin’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Aquasana Clean Water Machine (AQ-CWM2)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Brita Hub Countertop Water Filter System (87340)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
- IAPMO listing:NSF/ANSI 53checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Ninja HydraSense Countertop Water Filtration System (WF1001)
Countertop
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Water testing near Geronimo
The 3 labs Texas certifies closest to Geronimo, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Wallgren Environmental Services dba Pollution Control Services
Universal City, TX · about 22 miles
Certified for bacteria, lead and copper
Edwards Aquifer Research & Data Center, Texas State University
San Marcos, TX · about 23 miles
Certified for bacteria
San Antonio Metropolitan Health District
San Antonio, TX · about 32 miles
Certified for bacteria
Texas Well Owner Network, Texas A&M AgriLife Extension: Well Informed screening events, where well owners bring in water samples to be screened for common contaminants, followed by an hour-long session explaining the results. Upcoming events are on the network's calendar. Trainings, Texas Well Owner Network.
All 80 certified labs for TexasZIP codes in Geronimo
Which ZIP codes are in Geronimo: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: TCEQ, drinking water laboratories approved for public water system samples; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Geronimo
Towns nearby with a page of their own.
What to do next
- Read City of Seguin’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About Total trihalomethanes (TTHM)What it does to health, where it comes from, and the certification claim that addresses it.About Total trihalomethanes (TTHM)
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water