Slidell, LA

Slidell, LA

The City of Slidell is home to an estimated 27,883 residents, and it’s located in St. Tammany Parish, LA.

This report will help you become better acquainted with Slidell and the surrounding area by addressing the following questions:

  • Are there any hazardous sites in St. Tammany Parish, LA?
  • How clean is the air in St. Tammany Parish, LA?
  • What’s the average radon level for homes in St. Tammany Parish, LA?
  • Is the water in St. Tammany Parish, LA safe to drink?

Hazardous Sites near Slidell, LA

There are two Superfund sites in St. Tammany Parish, LA. Superfund sites, like Madisonville Creosote Works in Madisonville, LA, are areas that have been contaminated with hazardous substances. If not for the cleanup efforts orchestrated by the EPA, these sites could endanger people living in nearby communities.

The EPA uses the Hazardous Ranking System (HRS) to quantify the risk a contaminated site poses to human health and the environment. Sites assigned HRS scores of 28.5 or greater qualify for placement on the National Priorities List (NPL), and are eligible to receive federal funding for cleanup efforts.

Before the EPA deletes a site from the NPL, it conducts reviews to ensure the cleanup was sufficient. As a result, some sites remain on the active site list long after cleanup activities are complete.

For more information about the Superfund sites located in the Slidell, LA area, be sure to review the map and background information provided below:

Map Legend:


A. Madisonville Creosote Works (HRS Score: 48)

The Madisonville Creosote Works site is located in Madisonville, LA.

Contaminants found at the Madisonville Creosote Works site include:

  • Benzo(b)fluoranthene
  • Dibenzo(a,h)anthracene
  • Benzo[a]pyrene

B. Bayou Bonfouca (HRS Score: 30)

The Bayou Bonfouca site is located in Slidell, LA.

Contaminants found at the Bayou Bonfouca site include:

  • Benzene
  • Polycyclic Aromatic Hydrocarbons (PAHs)
  • Benzo[a]anthracene
  • Toluene
  • 2-Methylnaphthalene

Air Quality in the Slidell, LA Area

The two most widespread forms of air pollution are ozone (smog) and particle pollution (soot). Exposure to these harmful pollutants, for even just a short period, can have adverse effects on your health.

Thanks to data collected by air monitoring equipment located across the country, the American Lung Association (ALA) is able to assess and track our air quality using three metrics:

  • Ozone
  • Short-term Particle Pollution
  • Year-round Particle Pollution

In their 2019 annual report, the ALA rated the air quality in St. Tammany Parish, LA as follows:

Ozone Pollution

Grading Scale: A-F

Particle Pollution

Grading Scale: A-F

Particle Pollution

Grading Scale: Pass/Fail

DNC (Data Not Collected): Data on associated pollutants were not collected in this county or county equivalent.
INC (Incomplete): Associated pollutants are being monitored in this county or county equivalent, but data were insufficient to assign a grade.

Radon Levels in Slidell, LA Area

Air quality inside your home can be impacted by a number of factors, including the presence of hazardous substances in building materials (asbestos, lead, formaldehyde, etc.) and local radon levels.

Radon is a naturally occurring gas you cannot see or smell. It can build up inside your home and negatively impact your indoor air quality as well as your health.

To provide a guideline, the EPA assigned one of three zones to each U.S. county and county equivalent:

  • Zone 1 (higher radon levels)
  • Zone 2 (moderate levels)
  • Zone 3 (lower levels)

The average indoor radon reading in St. Tammany Parish, LA is predicted to be less than 2 picocuries per liter (pCi/L), so the county has been assigned EPA Radon Zone 3.

EPA Radon Zone

But, it's worth mentioning homes with elevated levels of radon have been found in all three radon zones. So, despite the fact Slidell, LA is in EPA Radon Zone 3, you should have a radon test performed on any home you purchase in the area.

Water Quality in Slidell, LA Area

In accordance with the Safe Drinking Water Act (SDWA), the EPA sets regulatory limits for drinking water contaminants known to cause adverse health effects.

The following St. Tammany Parish, LA water provider(s) violated the maximum allowable level for one or more regulated contaminants:

Filter ValueWater SystemContaminantHealth Effects
22103Tesi Rigolets EstatesTotal Haloacetic Acids (HAA5)Increased risk of cancer 
22103Tesi Rigolets EstatesTTHMLiver, kidney, or central nervous system problems; increased risk of cancer 
22103Timberland Mobile Home ParkTTHMLiver, kidney, or central nervous system problems; increased risk of cancer 

In addition to setting enforceable standards for harmful contaminants, the EPA also established guidelines to assist public water providers in managing the taste, odor and color of their drinking water.

To find out more about what’s in your drinking water, contact your utility company and request a copy of the latest Consumer Confidence Report.

Sources and Methods

Hazardous Sites: Identified using a report from the Environmental Protection Agency (EPA), hazardous sites detailed on represent sites contained on the National Priorities List (NPL) as of November 25, 2019.  The NPL is the list of national priorities among the known releases or threatened releases of hazardous substances, pollutants, or contaminants throughout the United States and its territories.  All site-related data was sourced from the EPA.

Air Quality: Grades for ozone, short-term particle pollution, and year-round particle pollution were obtained from State of the Air 2019, a report compiled by the American Lung Association.

Radon Zones: Radon zone designations were obtained using a public use dataset provided by the EPA (September 11, 2019).

Water Quality: Drinking water violation data was sourced from the Safe Drinking Water Information System (SDWIS), a public use database provided by the EPA.  The dataset included violations submitted to the database as of the third quarter of 2019.


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