Water Quality in San Marcos, TX (78130)
EPA violation data for public water systems serving ZIP code 78130.
Active Health Violations
9 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 94% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
104,009
Population
87
Water Systems
73
Violations (5yr)
9
Health-Based
Location
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Water Systems Serving This Area (87)
New Braunfels Utilities
All resolved Surface water 116,477 people served
1 violation (5yr)
· All resolved
Lead tested: 1.7 ppb (limit: 15 ppb) ✓
City Of San Marcos
Surface water 72,970 people served
0 violations
Lead tested: 1.63 ppb (limit: 15 ppb) ✓
Green Valley Sud
All resolved Purchased surface water 52,497 people served
4 violations (5yr)
· All resolved
Lead tested: 1.9 ppb (limit: 15 ppb) ✓
City Of Kyle
Purchased surface water 52,000 people served
0 violations
Lead tested: 1.91 ppb (limit: 15 ppb) ✓
Clwsc Canyon Lake Shores
3 health-based Surface water 44,196 people served
6 violations (5yr)
· 3 health-based · All resolved
Lead tested: 2 ppb (limit: 15 ppb) ✓
Texas State University - San Marcos
Groundwater 43,552 people served
0 violations
Lead tested: 1.3 ppb (limit: 15 ppb) ✓
City Of Schertz
Groundwater 41,948 people served
3 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓
Springs Hill Sud
2 health-based Surface water 35,472 people served
3 violations (5yr)
· 2 health-based · All resolved
Lead tested: 1.12 ppb (limit: 15 ppb) ✓
Goforth Sud
2 health-based Purchased surface water 34,893 people served
6 violations (5yr)
· 2 health-based · All resolved
Sjwtx Triple Peak Plant
All resolved Surface water 32,973 people served
2 violations (5yr)
· All resolved
Lead tested: 1.4 ppb (limit: 15 ppb) ✓
City Of Seguin
1 health-based Surface water 32,736 people served
1 violation (5yr)
· 1 health-based · All resolved
Lead tested: 1.45 ppb (limit: 15 ppb) ✓
Crystal Clear Sud
Purchased surface water 20,766 people served
0 violations
Lead tested: 1.6 ppb (limit: 15 ppb) ✓
City Of Cibolo
Purchased surface water 20,331 people served
0 violations
Lead tested: 1.1 ppb (limit: 15 ppb) ✓
County Line Sud
All resolved Purchased surface water 19,609 people served
2 violations (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Gbra Johnson Ranch Subdivision
Purchased surface water 2,322 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Canyon Lake Forest
Groundwater 2,079 people served
0 violations
Canyon Lake Village - West
Groundwater 2,010 people served
0 violations
Gbra Cordillera Ranch
1 health-based Purchased surface water 1,707 people served
3 violations (5yr)
· 1 health-based · All resolved
Canyon Lake Village
Groundwater 1,164 people served
0 violations
Deer River
Groundwater 1,089 people served
0 violations
Clwsc-Astro Hills
Groundwater 1,017 people served
0 violations
Rolling Hills Estates
Groundwater 939 people served
0 violations
Creekwood Estates
Groundwater 876 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Gbra Lomas Water Co Comal Trace
Purchased surface water 792 people served
0 violations
Gbra Coleto Creek Park
All resolved Groundwater 700 people served
1 violation (5yr)
· All resolved
Solms Water Supply Corporation
Groundwater 650 people served
0 violations
Mountain Valley School
Surface water 630 people served
0 violations
Tamarack Shores
Groundwater 579 people served
0 violations
Lakeview Park
Groundwater 576 people served
0 violations
Horseshoe Falls Estates Water Co
Groundwater 504 people served
0 violations
Smithson Valley Middle School
Groundwater 503 people served
0 violations
Woodland At Canyon Lake
Groundwater 500 people served
0 violations
Oaks The
Groundwater 483 people served
0 violations
Clwsc Northlake Estates
Groundwater 432 people served
0 violations
Water Front Park
Groundwater 402 people served
0 violations
Hoffman Lane Elementary School
Groundwater 394 people served
0 violations
Riverwood Estate
Groundwater 375 people served
0 violations
Tanglewood Shores
Groundwater 306 people served
0 violations
4 D Water
All resolved Groundwater 282 people served
6 violations (5yr)
· All resolved
Lead tested: 1 ppb (limit: 15 ppb) ✓
Bulverde Elementary School
Purchased surface water 265 people served
0 violations
Little Ponderosa
Surface water 250 people served
0 violations
Canyon Lake Mobile Home Estate
Groundwater 240 people served
0 violations
Clwsc Hillcrest
Groundwater 231 people served
0 violations
Northwoods Water System
Groundwater 189 people served
0 violations
Del Rio National Guard Basecamp Alpha
Groundwater 180 people served
0 violations
Scenic Terrace Water System
Groundwater 171 people served
0 violations
Seven Oaks Water Supply
Groundwater 165 people served
0 violations
Lead tested: 2.5 ppb (limit: 15 ppb) ✓
River Road Villas
Groundwater 160 people served
10 violations (5yr)
Rockford Place Mobile Home Park
Groundwater 147 people served
0 violations
Lake Of The Hills Water System
Groundwater 140 people served
0 violations
Park Plaza Apartments
Groundwater 130 people served
0 violations
Newk'S Tennis Ranch No 2
Groundwater 125 people served
0 violations
Servtex Plant
Groundwater 125 people served
0 violations
Uscoe-Potters Ck. Pk.
Groundwater 100 people served
0 violations
Mountain Breeze
Groundwater 100 people served
0 violations
Clwsc Rocky Creek
Groundwater 81 people served
0 violations
Hancock Canyon Subdivision
Groundwater 75 people served
0 violations
Lakeside Mobile Living
Groundwater 69 people served
0 violations
River Valley Campgrounds
Groundwater 60 people served
0 violations
Pollos El Gallo
All resolved Groundwater 56 people served
15 violations (5yr)
· All resolved
Cliff View Condominium Community
Groundwater 51 people served
9 violations (5yr)
Abbott'S Canoe Rentals
Groundwater 50 people served
0 violations
Shady Vale
Groundwater 50 people served
0 violations
Deep Acres Estates
Groundwater 38 people served
0 violations
San Miguel Springs Water Co
Groundwater 36 people served
0 violations
Scenic River Properties
Surface water 36 people served
0 violations
Highland Terrace
Groundwater 33 people served
0 violations
Rippling Rapids No 1
Groundwater 30 people served
0 violations
Rippling Rapids No 2
Groundwater 30 people served
0 violations
Uscoe-Cranes Mill Marina
Groundwater 26 people served
0 violations
Canyon Creek Estates
Groundwater 25 people served
0 violations
Moorwood-Canyon W. S.
Groundwater 25 people served
0 violations
Stallion Springs
Groundwater 24 people served
0 violations
Jonas Subdivision
Groundwater 15 people served
0 violations
Crwa Lake Dunlap Wtp
Surface water 14 people served
0 violations
Lakewood-Glenmare
Groundwater 10 people served
0 violations
Rancho Del Lago - Phase X
Groundwater 6 people served
0 violations
Cisd Seay Spring Branch Middle School
Groundwater 0
0 violations
Crwa Hays Caldwell Wtp
All resolved Surface water 0
1 violation (5yr)
· All resolved
Gbra Western Canyon Water Supply
Surface water 0
0 violations
Cisd Smithson Valley High School
Groundwater 0
0 violations
Crwa Wells Ranch
Groundwater 0
0 violations
Gbra Ih-35 Transmission Main
Purchased surface water 0
0 violations
Bill Brown Elementary School
Groundwater 0
0 violations
Gbra Luling Plant
Surface water 0
0 violations
Cisd Rahe Bulverde Elementary School
Purchased surface water 0
0 violations
National Guard Basecamp Laredo South
Purchased surface water 0
0 violations
Contaminants Found
TTHMHealth-Based
10 violations
All resolved
Interim Enhanced Surface Water Treatment RuleHealth-Based
1 violation
All resolved
Revised Total Coliform RuleMonitoring
Missed testing deadlines — not a detection of bacteria.
34 violations
All resolved
Public NoticeMonitoring
11 violations
Has active
Lead and Copper RuleMonitoring
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
6 violations
Has active
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
5 violations
All resolved
E. COLIMonitoring
2 violations
All resolved
ChlorineMonitoring
Used to disinfect water — generally safe at regulated levels.
2 violations
All resolved
CARBON, TOTALMonitoring
1 violation
All resolved
Lead & Copper Levels
Lead (Pb)
Within limit0 ppb measured
Action level: 15 ppb
Sampled: Jul 2025
How Does This Compare?
San Marcos (78130) has more violations than 94% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 73.
Fewer violations 94th percentile More violations
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.