Zoning and Industrial Siting Near LaPlace, St. John the Baptist Parish

A Long-Operating Plant With a Well-Documented Emissions Concern

DuPont built and for decades operated a chemical manufacturing plant near LaPlace producing chloroprene, the raw material for neoprene synthetic rubber; DuPont sold the plant to Denka Performance Elastomer in 2015, and it has continued operating as the only chloroprene-based neoprene plant in the United States. Chloroprene is classified by the U.S. Environmental Protection Agency as a likely human carcinogen, and a widely cited federal National Air Toxics Assessment identified the census tract surrounding the plant, near LaPlace, as carrying an unusually elevated estimated lifetime cancer risk from air toxics compared with the rest of the country -- reporting that drew sustained national attention to the community.

Federal Enforcement Action: What Happened, and What This Page Cannot Tell You

In the years following that assessment, EPA pursued stricter proposed chloroprene emission standards for the facility, and the U.S. Department of Justice, on EPA's behalf, brought an enforcement action against Denka over the plant's emissions. That sequence of events -- the air-toxics assessment, EPA's regulatory response, and a federal enforcement action -- is real, well-documented history. What this page cannot tell you is the current status of that action: whether it succeeded, was narrowed, was dismissed, or was resolved by settlement, and what current chloroprene emissions and monitoring data actually show. Federal environmental enforcement matters like this can move slowly and change outcome on appeal, so treat any specific current-status claim -- including from other sources -- with real skepticism until you confirm it directly with EPA or the Louisiana Department of Environmental Quality.

What This Means for Evaluating Land Near LaPlace or Reserve

If you're evaluating a residential parcel near LaPlace or Reserve, ask the Louisiana Department of Environmental Quality directly for current ambient air-monitoring data for the area, and ask EPA's regional office about the current status of any enforcement action or emissions-reduction requirement affecting the plant. Distance from the plant matters, but prevailing wind patterns and monitoring data matter more than straight-line distance for understanding actual exposure. This history is specific to the LaPlace/Reserve area near the plant -- it does not apply parish-wide, and most of St. John the Baptist Parish's land, including its historic sites and agricultural areas, sits well away from this specific concern.

It's also worth talking directly to residents or a local real-estate agent who has sold property in the immediate area, since lived experience of the community's own concerns and any local advocacy or monitoring efforts can surface practical, current context that official data releases lag behind. None of this is a reason to treat the whole parish as undesirable -- it's a reason to bring specific, informed questions to a specific parcel near the plant rather than either dismissing the concern or overreacting to it without direct, current information.