East Baton Rouge Parish Water Report

East Baton Rouge Parish earns an A grade for drinking water quality, scoring 70.4 out of 100. Over the past five years, EPA SDWIS records 5 health-based violations — a pattern that public water utilities are required to disclose and correct.

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A large majority — 88.3% — of assessed waterways are impaired (98 of 111 water bodies) across East Baton Rouge Parish's watersheds. The leading impairment causes are dissolved oxygen and mercury - fish consumption advisory. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

USGS NWIS gauge data (as of 2026-05-14T13:15:00.000-05:00) puts Amite River at 5.3k cfs — running significantly above its long-term average at 250% of mean flow. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. East Baton Rouge Parish has extensive coverage with 146 active monitoring sites with 3,363 recent measurements on record. Predominant monitoring categories include physical and organics, other. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.