Is San Marcos, Texas tap water safe?

8 water systems report serving San Marcos. Your water depends on which one serves your address. Check your bill if unsure. This list is matched from the ZIP codes in this place, so it may include nearby systems.

B

City of San Marcos

Serves 72,970 people · Surface water · Full report →
1 health-based violation in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Texas State University - San Marcos

Serves 43,552 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Crystal Clear SUD

Serves 20,766 people · Surface water · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D

Maxwell SUD

Serves 16,104 people · Surface water · Full report →
16 health-based violations in the last 5 years; 5 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Oak Meadows

Serves 954 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
A

The Woodlands Water System

Serves 195 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2024).
C

Blue Agave Mobile Home Park

Serves 57 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 8 monitoring/reporting violations; 3 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
A

Alliance Regional Water Authority 1b

Population not reported (often a wholesaler) · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file.