Manganese, arsenic and lead are worth checking in Tangipahoa Parish wells.
3 worth checking, 1 rare out of 4 health checks.
From 36 wells tested in Tangipahoa Parish since 2001; your own well needs its own test. How to read this
Not charted, because fewer than 10 wells were tested: nitrate (8), uranium (8), radon (5).
Rare: under 5%Worth checking: 5 to 15%Widespread: 15%+
Lab results: Water Quality Portal (USGS and EPA)
Who drinks from a well here
1 in 3 people 51,989 people
Nobody else tests these wells. Only you do.
People on wells: EPA researchers' 2020 estimate
How deep wells go here
Middle depth: some shelter from the surface, not complete.
Well depths: US Groundwater Well Database
Radon risk (a gas from rock)
Less likely, but the EPA still says test your air.
Radon zones: EPA map
Here's how Tangipahoa Parish compares with Louisiana and the counties around it.
Each result puts Tangipahoa Parish next to the 7 counties that border it, on the chart's 0 to 50% scale.
These 3 are worth checking in Tangipahoa Parish.
Manganese2 of 15 wells over
Too few tested to show: Amite, MS, Livingston, Pike, MS, St. Helena, St. John the Baptist, Washington.
Arsenic1 of 10 wells over
Lead1 of 10 wells over
This one is rare in Tangipahoa Parish.
Fluoride0 of 34 wells over
Too few tested to show: Amite, MS, Pike, MS, St. Helena, St. John the Baptist, Washington.
Too few Tangipahoa Parish wells were tested for these 3.
Nitrate8 wells tested
Uranium8 wells tested
Radon in water5 wells tested
None of the 1 Tangipahoa Parish wells tested for bacteria had it, but every well needs a yearly test.
Coliform bacteria0 of 1 wells had it
E. coli0 of 1 wells had it
E. coli means human or animal waste is getting in, so if a test of your Tangipahoa Parish well finds it, boil drinking water until the well is fixed.
Iron reached staining levels in 3 of 15 tested wells, and it isn't a health risk.
Iron stains3 of 15 wells had it
Too few tested to show: Amite, MS, Livingston, Pike, MS, St. Helena, St. John the Baptist, Washington.
Most of the 36 wells tested in Tangipahoa Parish were last tested before 2010.
An old result shows the water as it was then, so treat these 36 wells as a starting point and test your own.
Most Tangipahoa Parish wells in these records were tested for research or because someone suspected a problem, which can push the shares above what a typical home well would show (how we read the numbers).
One mail-in lab test covers the 5 things to check in Tangipahoa Parish.
- Bacteria
- Nitrate
- Manganese
- Arsenic
- Lead
What Louisiana offers well owners
- Free testingWe didn't find a free program for all of Louisiana. Louisiana's private well page
- Certified labsWe didn't find an online list.
- Well recordsLouisiana's well record search
Half the household wells here are shallower than 120 feet.
That comes from 8,101 household wells in Louisiana's drilling records. Most wells of every kind here are 100 to 180 feet deep. Wells as deep as Tangipahoa Parish's are usually better protected from fertilizer and bacteria at the surface, but they can pick up more of what's in the rock, like arsenic and uranium. Typical household wells here are shallower than in 36 of the 57 other Louisiana counties with enough drilling records.
Look up your own well's depth in Louisiana's well record search, or see how to find it.
Well depths: US Groundwater Well Database
Here's what we know about radon and PFAS in Tangipahoa Parish.
Tangipahoa Parish is in the EPA's lowest radon zone, so radon from well water is unlikely to be a problem. Radon guide
Between 2023 and 2025 the EPA had 7 town water systems in Tangipahoa Parish test for PFAS. None found any. No well in Tangipahoa Parish has public PFAS results, so the town systems are the best clue to what's in the groundwater nearby. PFAS guide
Radon zones: EPA Map of Radon Zones. PFAS: EPA tests of town water systems, 2023 to 2025
Questions people ask about well water in Tangipahoa Parish
Is well water in Tangipahoa Parish safe to drink?
2 of 15 wells tested in Tangipahoa Parish had manganese over the limit, about 1 in 8. Across Louisiana it's about 2 in 10. That's a smaller share than in 12 of the 23 other Louisiana counties with 10 or more tested wells. So test your own well for manganese before you count on it.
Where can I get my well tested in Tangipahoa Parish?
Use a lab Louisiana has certified for drinking water. Louisiana's list is linked above, in the box about testing. Ask for bacteria, nitrate, manganese, arsenic and lead, the tests that matter most in Tangipahoa Parish.
How deep are wells in Tangipahoa Parish?
Half the household wells here are shallower than 120 feet. Typical household wells here are shallower than in 36 of the 57 other Louisiana counties with enough drilling records.
How does Tangipahoa Parish compare with the counties around it?
For manganese, the share of tested wells over the limit: St. Tammany, the one neighbor with data, came in lower than Tangipahoa Parish, at 0% against 13%. Groundwater doesn't stop at county lines, so St. Tammany's 0% is worth knowing about if you live near it.
How often should I test my well in Tangipahoa Parish?
None of the 1 wells tested for bacteria in Tangipahoa Parish had it, but the CDC still says to test for bacteria and nitrate every year, and right away after a flood, a repair, or any change in taste or smell.
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Where the Tangipahoa Parish numbers come from
- People on wells: 51,989 in Tangipahoa Parish, from EPA estimates built on the 2020 Census (Murray et al.).
- Lab tests: 139 well water samples from 36 wells in the Water Quality Portal, run by the USGS and EPA, 2001 to 2015.
- Well depths: 8,101 Louisiana drilling records for Tangipahoa Parish, gathered in the US Groundwater Well Database (Lin and others, 2024).
- Neighboring counties: the 7 counties that share a border with Tangipahoa Parish, from the Census Bureau's county adjacency file.
- PFAS: EPA tests of 7 town water systems in Tangipahoa Parish under the Fifth Unregulated Contaminant Monitoring Rule, 2023 to 2025.
- Radon: Tangipahoa Parish is zone 3 on the EPA Map of Radon Zones.
- State programs and links: Louisiana Department of Health, checked November 1, 2026.