ARLINGTON COUNTY: EPA violation history, explained

ARLINGTON COUNTY has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 215,000 people get their water from it, across 37,076 connections.

Ranked against every other system in this dataset

ARLINGTON COUNTY has 5 violations on record in total, 2 of thems health-based - ranking it 6,827th of 12,903 systems by violation count, the 47th percentile nationally.

How ARLINGTON COUNTY compares within VA

VA's 186 covered systems average 4.2 health-based violations each; ARLINGTON COUNTY carries 2, not 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 ARLINGTON COUNTY is from 2007-01-10 (health-based: 1994-01-06). Last reported to EPA: 05/19/2026.

What kind of problem, specifically

ARLINGTON COUNTY'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)

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

This is what ARLINGTON COUNTY reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 5 logged violations can see. The guide to what this data misses covers that gap.