A100/100
TESORO VIEJO MASTER MWC, INC. — Water Quality Report 2026
Serving 3,885 people · California
Water Source
Surface Water
County
—
System ID
CA2010017
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 TESORO VIEJO MASTER MWC, INC.
Is TESORO VIEJO MASTER MWC, INC. water safe to drink?
TESORO VIEJO MASTER MWC, INC. water receives a grade of A (100/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has TESORO VIEJO MASTER MWC, INC. detected?
1 contaminants were tested in TESORO VIEJO MASTER MWC, INC.'s water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does TESORO VIEJO MASTER MWC, INC. have any EPA violations?
No, TESORO VIEJO MASTER MWC, INC. has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does TESORO VIEJO MASTER MWC, INC. serve?
TESORO VIEJO MASTER MWC, INC. serves approximately 3,885 people, California.
What type of water does TESORO VIEJO MASTER MWC, INC. provide?
TESORO VIEJO MASTER MWC, INC. 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 CA2010017.
How does TESORO VIEJO MASTER MWC, INC. compare to other utilities in California?
TESORO VIEJO MASTER MWC, INC. 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.