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PUBLIC WATER SYSTEM REPORT

Is CITY OF SAN MARCOS Water Safe to Drink in 2026?

Texas · PWSID TX1050001 · Surface water

Population served
72,970
Cities served
—
State / jurisdiction
Texas (TX)
PWSID
TX1050001
F
TAP WATER GRADE
High risk
Model score 20/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
38 violation record(s) in the latest EPA SDWA quarterly snapshotPFAS compounds detected in UCMR5 monitoring

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CONTAMINANTS — EPA UCMR5 MONITORING
Compound
Level (ppt)
EPA limit
Health guideline
Status
PFBA
11.4
—
Within / n/a
Unregulated (monitored)
PFPeA
4.2
—
Within / n/a
Unregulated (monitored)
PFHxSregulated
3.4
10 ppt
Within / n/a
MCL exceedance

Source: EPA UCMR5 · ppt = parts per trillion · MCL = enforceable limit for regulated PFAS

VIOLATIONS HISTORY (FEDERAL SNAPSHOT)

EPA’s national SDWA quarterly files associate 38 violation-related records with this system in the same reporting quarter as the utility snapshot used on WaterCheckup. This is not a complete historical docket — see ECHO and SDWIS for full compliance context.

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WHAT TO DO ABOUT IT

Based on CITY OF SAN MARCOS's monitoring and violation profile, here are vetted filtration options — same picks framework as our city reports.

TOP PICKS FOR CITY OF SAN MARCOS
⚠ EPA violations / contaminants in monitoring data
#1
Waterdrop G3P800 RO
EDITORS PICK
Waterdrop  ·  ~$849
Tankless 800 GPD, removes 99%+ PFAS & lead, 10-stage filtration. Smart faucet TDS display.
WHY THIS FOR CITY OF SAN MARCOS · Chosen for CITY OF SAN MARCOS because the latest federal SDWA snapshot lists substantial violation activity. Certified reverse osmosis provides the broadest residential barrier for households that want margin beyond legal compliance.
#2
Aquasana SmartFlow RO
MOST CERTIFIED
Aquasana  ·  ~$449
WQA Gold Seal + NSF 42/53/58/401. Most certifications of any under-sink RO. Removes 90+ contaminants.
#3
AquaTru Under-Sink RO
EASIEST FILTER CHANGE
AquaTru  ·  ~$375
NSF 42/53/58 certified. Quick-change filters, no tools. Compact tankless design, 4-stage filtration.
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STAY INFORMED
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