Is Rancho Viejo, TX tap water safe?
The short answer
2 of the 3 utilities serving Rancho Viejo have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Texas’s records: Valley MUD 2 Rancho Viejo and Olmito WSC.
Valley MUD 2 Rancho Viejo, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 6.8 ppb, above the health goal. 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 Rancho Viejo’s ZIP codes, from EPA’s estimates.
- Open report
Valley MUD 2 Rancho Viejo
Texas · serves 3,644 people · about 710 in Rancho Viejo
2 results above the health goal. The worst: Arsenic at 6.8 ppb, above the health goal.
4 health-based violations since 2016
- Open report
Olmito WSC
Texas · serves 8,952 people · about 510 in Rancho Viejo
1 result above the legal limit, 1 result above EPA’s new limit, which takes effect in 2029, 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Total trihalomethanes (TTHM) at 76.5 ppb, above the legal limit.
1 health-based violation since 2016
- Open report
Brownsville Public Utilities Board
Texas · serves 201,249 people · under 100 in Rancho Viejo
2 results 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: PFOS at 9.2 ppt, above EPA’s new limit, which takes effect in 2029.
No health-based violations 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 Valley MUD 2 Rancho Viejo’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
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
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
Water testing near Rancho Viejo
The lab Texas certifies closest to Rancho Viejo, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Texas Department of State Health Services South Texas Laboratory
Harlingen, TX · about 24 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 TexasWhich ZIP codes are in Rancho Viejo: 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 Rancho Viejo
Other towns in Cameron County with a page of their own.
What to do next
- Read Valley MUD 2 Rancho Viejo’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for ArsenicRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water