Water Quality in San Marcos, TX (78676)
EPA violation data for public water systems serving ZIP code 78676.
Active Health Violations
10 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 99% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
15,822
Population
46
Water Systems
337
Violations (5yr)
10
Health-Based
Location
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Water Systems Serving This Area (46)
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) ✓
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) ✓
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) ✓
County Line Sud
All resolved Purchased surface water 19,609 people served
2 violations (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Wimberley Wsc
All resolved Groundwater 5,334 people served
1 violation (5yr)
· All resolved
Lead tested: 2.08 ppb (limit: 15 ppb) ✓
Shiloh Springs
Groundwater 650 people served
2 violations (5yr)
Cedar Oak Mesa Wsc
Groundwater 497 people served
8 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓
The Springs Event Venue
Groundwater 350 people served
6 violations (5yr)
Sellers Wine Bar
All resolved Purchased surface water 300 people served
1 violation (5yr)
· All resolved
Skyline Ranch Estates Wsc
1 health-based Groundwater 261 people served
2 violations (5yr)
· 1 health-based · All resolved
Lead tested: 1.29 ppb (limit: 15 ppb) ✓
St Marks Episcopal Church Pws Improvemen
Groundwater 225 people served
0 violations
La Caleta Estates
1 health-based Purchased groundwater 152 people served
6 violations (5yr)
· 1 health-based · All resolved
Lead tested: 5.25 ppb (limit: 15 ppb) ✓
Lsr Wsc
1 health-based Groundwater 126 people served
3 violations (5yr)
· 1 health-based · All resolved
Lead tested: 0.88 ppb (limit: 15 ppb) ✓
Saint Stephens Episcopal Church & School
Groundwater 120 people served
2 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cypress Acres Ranch Resort
Groundwater 120 people served
0 violations
Shady Oaks Rv Resort And Park
1 health-based Groundwater 100 people served
2 violations (5yr)
· 1 health-based · All resolved
Junction Wtx
Groundwater 100 people served
3 violations (5yr)
Rim Rock Ranch
Groundwater 95 people served
0 violations
Vfw Post 6441
All resolved Groundwater 80 people served
5 violations (5yr)
· All resolved
Oaks Mobile Home Park
1 health-based Groundwater 75 people served
37 violations (5yr)
· 1 health-based
Inwood Forest
Groundwater 72 people served
0 violations
Wimberley Oaks Wsc
Groundwater 69 people served
8 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cypress Creek Acres Water Supply Co
Groundwater 65 people served
0 violations
Farm House Escape
Purchased surface water 60 people served
0 violations
Sebring Medical Office Bldg
Groundwater 50 people served
4 violations (5yr)
Dobie Lane South Water System
Groundwater 37 people served
0 violations
The Bygone
All resolved Groundwater 34 people served
10 violations (5yr)
· All resolved
Cypress Springs On The Guadalupe
Groundwater 27 people served
0 violations
Hil Cris, Inc.
Groundwater 25 people served
0 violations
Buena Vista Rv Park
Groundwater 25 people served
0 violations
Dobie Lane Acres North Water
Groundwater 17 people served
0 violations
Woodcreek Ranch
Groundwater 15 people served
0 violations
Lone Man Creek
Groundwater 15 people served
0 violations
Don Carrs Junction
Groundwater 0
0 violations
Espinazo Del Diablo
Groundwater 0
0 violations
Jobell Cafe & Bistro
All resolved Purchased surface water 0
6 violations (5yr)
· All resolved
Freedom-14 Camp
Purchased surface water 0
0 violations
Serenity Farmhouse Inn
All resolved Groundwater 0
170 violations (5yr)
· All resolved
Corazon De Mexico
All resolved Purchased surface water 0
18 violations (5yr)
· All resolved
St Boniface Episcopal Church
Groundwater 0
0 violations
River City Land Ventures
Groundwater 0
0 violations
Hildees Restaurant
All resolved Purchased surface water 0
26 violations (5yr)
· All resolved
Contaminants Found
LEAD AND COPPER RULE REVISIONSHealth-Based
8 violations
Has active
TTHMHealth-Based
5 violations
All resolved
Interim Enhanced Surface Water Treatment RuleHealth-Based
1 violation
All resolved
Groundwater RuleHealth-Based
1 violation
All resolved
Revised Total Coliform RuleMonitoring
Missed testing deadlines — not a detection of bacteria.
70 violations
All resolved
Public NoticeMonitoring
54 violations
Has active
Lead and Copper RuleMonitoring
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
23 violations
Has active
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
8 violations
Has active
ChlorineMonitoring
Used to disinfect water — generally safe at regulated levels.
5 violations
All resolved
E. COLIMonitoring
5 violations
All resolved
NitrateMonitoring
At high levels, nitrate can cause blue baby syndrome in infants.
4 violations
All resolved
1,1-DichloroethyleneMonitoring
3 violations
All resolved
Carbon tetrachlorideMonitoring
3 violations
All resolved
Xylenes, TotalMonitoring
3 violations
All resolved
HexachlorocyclopentadieneMonitoring
3 violations
All resolved
Benzo(a)pyreneMonitoring
3 violations
All resolved
AldicarbMonitoring
3 violations
All resolved
2,4,5-TPMonitoring
3 violations
All resolved
TetrachloroethyleneMonitoring
3 violations
All resolved
o-DichlorobenzeneMonitoring
3 violations
All resolved
HEXACHLOROBENZENEMonitoring
3 violations
All resolved
BenzeneMonitoring
3 violations
All resolved
AtrazineMonitoring
3 violations
All resolved
EthylbenzeneMonitoring
3 violations
All resolved
Di(2-ethylhexyl) phthalateMonitoring
3 violations
All resolved
Heptachlor epoxideMonitoring
3 violations
All resolved
CHLOROBENZENEMonitoring
3 violations
All resolved
SimazineMonitoring
3 violations
All resolved
1,2-DichloropropaneMonitoring
3 violations
All resolved
1,2-DIBROMO-3-CHLOROPROPANEMonitoring
3 violations
All resolved
ETHYLENE DIBROMIDEMonitoring
3 violations
All resolved
TrichloroethyleneMonitoring
3 violations
All resolved
DICHLOROMETHANEMonitoring
3 violations
All resolved
p-DichlorobenzeneMonitoring
3 violations
All resolved
EndrinMonitoring
3 violations
All resolved
MethoxychlorMonitoring
3 violations
All resolved
TolueneMonitoring
3 violations
All resolved
LASSOMonitoring
3 violations
All resolved
OXAMYLMonitoring
3 violations
All resolved
Aldicarb sulfoneMonitoring
3 violations
All resolved
1,1,2-TrichloroethaneMonitoring
3 violations
All resolved
cis-1,2-DichloroethyleneMonitoring
3 violations
All resolved
Aldicarb sulfoxideMonitoring
3 violations
All resolved
BHC-GAMMAMonitoring
3 violations
All resolved
1,1,1-TrichloroethaneMonitoring
3 violations
All resolved
2,4-DMonitoring
3 violations
All resolved
HeptachlorMonitoring
3 violations
All resolved
trans-1,2-DichloroethyleneMonitoring
3 violations
All resolved
PentachlorophenolMonitoring
3 violations
All resolved
Di(2-ethylhexyl) adipateMonitoring
3 violations
All resolved
1,2,4-TrichlorobenzeneMonitoring
3 violations
All resolved
CarbofuranMonitoring
3 violations
All resolved
1,2-DichloroethaneMonitoring
3 violations
All resolved
DinosebMonitoring
3 violations
All resolved
StyreneMonitoring
3 violations
All resolved
Vinyl chlorideMonitoring
3 violations
All resolved
ToxapheneMonitoring
3 violations
All resolved
ChlordaneMonitoring
3 violations
All resolved
DalaponMonitoring
3 violations
All resolved
PicloramMonitoring
3 violations
All resolved
CARBON, TOTALMonitoring
1 violation
All resolved
Gross Alpha, Excl. Radon and UMonitoring
1 violation
All resolved
Combined UraniumMonitoring
1 violation
All resolved
Combined Radium (-226 and -228)Monitoring
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 (78676) has more violations than 99% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 337.
Fewer violations 99th 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.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
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.