Water Quality in San Marcos, CA
6 water systems serving 113,780 people
City Overview
Average lead detection across San Marcos water systems is 0.0 ppb (Very low). The EPA action level is 15 ppb.
Violation Summary
| Total violations on record | 151 |
| Health-based violations | 52 |
| Lead action level violations | 0 |
| Open (unresolved) violations | 0 |
Water Systems in San Marcos
Frequently Asked Questions
Is San Marcos tap water safe to drink?
San Marcos tap water meets EPA standards for most contaminants. Review the individual water system pages below for the latest lead sample results and violation history.
What is the water quality in San Marcos, California?
San Marcos has 6 public water systems serving approximately 113,780 people. The average lead level across sampled systems is 0.0 ppb. There are 151 total violations on record.
Does San Marcos have lead in the water?
EPA monitoring data shows an average lead detection of 0.0 ppb across San Marcos's water systems. The EPA action level is 15 ppb. No lead action level violations are currently reported.
How many water utilities serve San Marcos?
6 public water systems are registered in San Marcos, California with the EPA Safe Drinking Water Information System. Together they serve approximately 113,780 people.