Is OILDALE MWC's water safe to drink?
OILDALE MWC had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 44,899 people get their water from it, across 13,172 connections.
How this compares nationally
Out of 12,903 systems in this dataset, OILDALE MWC ranks 2,480th by violation burden (81th percentile) - 13 violations total, 8 health-baseds.
How OILDALE MWC compares within CA
CA's 803 covered systems average 5.8 health-based violations each; OILDALE MWC carries 8, more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for OILDALE MWC is from 2024-01-10 (health-based: 2024-01-04). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
OILDALE MWC's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
- Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
OILDALE MWC's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. This record - 8 health-based violations on file for OILDALE MWC - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.