WILMINGTON WATER DEPARTMENT: EPA violation history, explained
WILMINGTON WATER DEPARTMENT has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 107,976, over 37,915 connections.
WILMINGTON WATER DEPARTMENT's record against the rest of the country
Out of 12,903 systems in this dataset, WILMINGTON WATER DEPARTMENT ranks 4,305th by violation burden (67th percentile) - 13 violations total, 4 health-baseds.
How WILMINGTON WATER DEPARTMENT compares within DE
DE's 25 covered systems average 2.2 health-based violations each; WILMINGTON WATER DEPARTMENT carries 4, more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for WILMINGTON WATER DEPARTMENT is from 2023-01-08 (health-based: 2017-01-10). Last reported to EPA: 04/30/2026.
What kind of problem, specifically
WILMINGTON WATER DEPARTMENT'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); Long Term 2 Enhanced Surface Water Treatment Rule; Surface Water Treatment Rule
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
Everything on this page is WILMINGTON WATER DEPARTMENT's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and WILMINGTON WATER DEPARTMENT's customers' taps is household plumbing, invisible to a system-level record ranked 4,305th of 12,903 by violation count. The guide to what this data misses covers that gap.