A100/100
CARLSBAD MWD — Water Quality Report 2026
Serving 95,158 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3710005
Violations
0
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CARLSBAD MWD
Is CARLSBAD MWD water safe to drink?
CARLSBAD MWD water receives a grade of A (100/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CARLSBAD MWD detected?
69 contaminants were tested in CARLSBAD MWD's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CARLSBAD MWD have any EPA violations?
No, CARLSBAD MWD has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does CARLSBAD MWD serve?
CARLSBAD MWD serves approximately 95,158 people, California.
What type of water does CARLSBAD MWD provide?
CARLSBAD MWD sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3710005.
How does CARLSBAD MWD compare to other utilities in California?
CARLSBAD MWD scores 100/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.