Is Willis, TX tap water safe?
The short answer
4 of the 15 utilities serving Willis 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 Willis, Texas National MUD, Serenity Woods Subdivision and 1 more.
City of Willis, which serves the most people here, has 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 199 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
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 Willis’s ZIP codes, from EPA’s estimates.
- Open report
City of Willis
Texas · serves 14,133 people · about 230 in Willis
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 199 ppb, above EPA’s health benchmark.
2 health-based violations since 2016
- Open report
Arrowhead Lake & Frontier Lake
Texas · serves 2,208 people · under 100 in Willis
2 results above the health goal. The worst: Uranium at 7.9 ppb, above the health goal.
No health-based violations since 2016
- Open report
Point Aquarius MUD
Texas · serves 3,228 people · under 100 in Willis
2 results above the health goal. The worst: Arsenic at 2.5 ppb, above the health goal.
No health-based violations since 2016
- Open report
Caddo Village
Texas · serves 1,395 people · under 100 in Willis
3 results above the health goal. The worst: Arsenic at 4.2 ppb, above the health goal.
No health-based violations since 2016
- Open report
Montgomery County UD 2
Texas · serves 3,381 people · under 100 in Willis
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Lake Conroe Hills MUD
Texas · serves 2,058 people · under 100 in Willis
1 result above the health goal. The worst: Lead at 0.79 ppb, above the health goal.
No health-based violations since 2016
- Open report
Texas National MUD
Texas · serves 931 people · under 100 in Willis
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 34.3 ppb, above EPA’s health benchmark.
1 health-based violation since 2016
- Open report
Serenity Woods Subdivision
Texas · serves 468 people · under 100 in Willis
2 results above the health goal. The worst: Arsenic at 3.9 ppb, above the health goal.
1 health-based violation since 2016
- Open report
Far Hills Utility District
Texas · serves 2,030 people · under 100 in Willis
1 result above the health goal. The worst: Lead at 1.2 ppb, above the health goal.
No health-based violations since 2016
- Open report
Walnut Cove WSC
Texas · serves 2,076 people · under 100 in Willis
1 result above the health goal. The worst: Lead at 2.6 ppb, above the health goal.
No health-based violations since 2016
5 more utilities in Willis
By EPA’s estimate, each serves fewer people in Willis than those above.
- Emerald Lakes Subdivisionserves 1,053 people · under 100 in Willis · no health-based violations since 2016
- Rogers Road Water Systemserves 567 people · under 100 in Willis · no health-based violations since 2016
- Shadow Bay Subdivisionserves 828 people · under 100 in Willis · no health-based violations since 2016
- Creekside Acres Water Systemserves 567 people · under 100 in Willis · no health-based violations since 2016
- Timber Line Estatesserves 579 people · under 100 in Willis · 1 health-based violation since 2016
MUD stands for municipal utility district, a local water and sewer district common in Texas.
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Willis’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic, Lead
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic, Lead
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic, Lead
Water testing near Willis
The 3 labs Texas certifies closest to Willis, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Nova Biologicals, Inc.
Conroe, TX · about 10 miles
Certified for bacteria
Eastex Environmental Lab, Inc. -Coldspring
Coldspring, TX · about 21 miles
Certified for bacteria, lead and copper
Chaparral Laboratories, Inc.
Huntsville, TX · about 25 miles
Certified for bacteria, lead and copper
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 TexasWhich ZIP codes are in Willis: 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 Willis
Towns nearby with a page of their own.
What to do next
- Read City of Willis’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water