A88/100
RINCON DEL DIABLO MWD (ID-1) — Water Quality Report 2026
Serving 30,757 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3710018
Violations
4
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2014.
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 RINCON DEL DIABLO MWD (ID-1)
Is RINCON DEL DIABLO MWD (ID-1) water safe to drink?
RINCON DEL DIABLO MWD (ID-1) water receives a grade of A (88/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has RINCON DEL DIABLO MWD (ID-1) detected?
69 contaminants were tested in RINCON DEL DIABLO MWD (ID-1)'s water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does RINCON DEL DIABLO MWD (ID-1) have any EPA violations?
Yes, RINCON DEL DIABLO MWD (ID-1) has 4 EPA violation(s) on record, with the most recent in 2014. Violation types include MCL, MR, Other. 2 are health-based violations.
How many people does RINCON DEL DIABLO MWD (ID-1) serve?
RINCON DEL DIABLO MWD (ID-1) serves approximately 30,757 people, California.
What type of water does RINCON DEL DIABLO MWD (ID-1) provide?
RINCON DEL DIABLO MWD (ID-1) 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 CA3710018.
How does RINCON DEL DIABLO MWD (ID-1) compare to other utilities in California?
RINCON DEL DIABLO MWD (ID-1) scores 88/100 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.