D21/100
LAKE DON PEDRO CSD — Water Quality Report 2026
Serving 3,240 people · California
Water Source
Surface Water
County
—
System ID
CA5510008
Violations
27
Contaminant Test Results
EPA Violation History
4
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2025 – May 31, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Enforcement: Formal — state order issued
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 LAKE DON PEDRO CSD
Is LAKE DON PEDRO CSD water safe to drink?
LAKE DON PEDRO CSD water receives a grade of D (21/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 27 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has LAKE DON PEDRO CSD detected?
8 contaminants were tested in LAKE DON PEDRO CSD's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does LAKE DON PEDRO CSD have any EPA violations?
Yes, LAKE DON PEDRO CSD has 27 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, RPT, TT. 13 are health-based violations.
How many people does LAKE DON PEDRO CSD serve?
LAKE DON PEDRO CSD serves approximately 3,240 people, California.
What type of water does LAKE DON PEDRO CSD provide?
LAKE DON PEDRO CSD sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA5510008.
How does LAKE DON PEDRO CSD compare to other utilities in California?
LAKE DON PEDRO CSD scores 21/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.