East Baton Rouge Parish, Louisiana: drinking water report. East Baton Rouge Parish encompasses Baton Rouge and about 456,000 residents.
East Baton Rouge Parish encompasses Baton Rouge and about 456,000 residents. The parish draws water from the Southern Hills Aquifer system – a deep, high-quality groundwater source that produces some of the best raw drinking water in the state. The Baton Rouge Water Company operates one of the largest groundwater-sourced systems in the South. Despite the quality of the aquifer, the parish faces growing threats from industrial contamination and saltwater intrusion.
The Baton Rouge Fault divides the parish's aquifer into northern and southern sections. According to the USGS's 2024 Baton Rouge area groundwater report, saltwater encroachment from the south has advanced northward across the fault in the 2,000-foot sand aquifer, threatening production wells that serve the city's southern neighborhoods. Decades of heavy pumping have lowered water levels enough to draw saltwater toward the fresh water zones.
The petrochemical corridor along the Mississippi River between Baton Rouge and New Orleans – sometimes called "Cancer Alley" – includes facilities in the parish. A 2024 LDEQ report found PFAS in monitoring wells near the Baton Rouge Metropolitan Airport at 15 ppt combined, consistent with historical AFFF use.
Baton Rouge has historically enjoyed excellent groundwater quality, but saltwater intrusion and PFAS contamination signal that the status quo is changing. Residents in the southern part of the parish may notice increasing hardness or mineral content as saltwater migrates toward production wells.
Check your water for current data at your address. For the emerging concerns in this area, reverse osmosis addresses both elevated minerals from saltwater intrusion and PFAS. Our water filter guide covers systems suited to groundwater supplies. Get your detailed report for trends, and visit our Louisiana page for statewide patterns.
Drinking water is one exposure route. These federal datasets also cover East Baton Rouge Parish, LA.
The EPA places East Baton Rouge Parish, LA in Zone 3 - the EPA's lowest-risk category, with a predicted average indoor radon level below 2 pCi/L. Zone maps predict an area's radon potential from geology and existing indoor readings; they say nothing about a specific house. Testing is the only way to know your own level.
45% of homes in East Baton Rouge Parish, LA were built before 1980, and 7% before 1950. Residential lead paint was banned in 1978, so housing age is the strongest available proxy for lead-paint exposure. This describes the county's housing stock, not any one home.
Modelled annual fine-particle pollution (PM2.5) in East Baton Rouge Parish, LA averages 9.6 µg/m³, above the EPA's annual standard of 9 µg/m³. These are CDC modelled county estimates rather than readings from a specific monitor.
How radon zones work · Air quality by county · Lead exposure guide