Only 2 health checks had enough tested wells in Brazoria County, and both came back rare.
Both health checks came back rare here.
From 20 wells tested in Brazoria County since 2012; your own well needs its own test. How to read this
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 5 people 79,301 people
Nobody else tests these wells. Only you do.
People on wells: EPA researchers' 2020 estimate
How deep wells go here
Deep wells: fewer surface germs, more minerals from the rock.
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 Brazoria County compares with Texas and the counties around it.
Each result puts Brazoria County next to the 5 counties that border it, on the chart's 0 to 50% scale.
Both health checks are rare in Brazoria County.
Fluoride0 of 20 wells over
Too few tested to show: Fort Bend, Galveston, Matagorda, Wharton.
Manganese0 of 20 wells over
Too few tested to show: Fort Bend, Galveston, Matagorda, Wharton.
Every well needs a bacteria test every year.
No bacteria tests from Brazoria County wells are in the public data. Test every year anyway.
Iron reached staining levels in 11 of 20 tested wells, and it isn't a health risk.
Iron stains11 of 20 wells had it
Too few tested to show: Fort Bend, Galveston, Matagorda, Wharton.
All 20 wells tested in Brazoria County were tested in 2012.
None of the 20 wells has a test from 2020 or later, so a fresh test of your own well tells you more than any of these.
Most Brazoria County 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 3 things to check in Brazoria County.
- Bacteria
- Nitrate
- Arsenic
What Texas offers well owners
- Free testingTexas A&M AgriLife Extension's Texas Well Owner Network holds periodic county well water screenings, some free and some for a small per-sample fee. See the program
- Certified labsTexas's list of certified labs
- Well recordsTexas's well record search
Half the household wells here are shallower than 350 feet.
That comes from 8,029 household wells in Texas's drilling records. Most wells of every kind here are 180 to 450 feet deep. Wells as deep as Brazoria County'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 go deeper than in 172 of the 248 other Texas counties with enough drilling records.
Look up your own well's depth in Texas'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 Brazoria County.
Brazoria County 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 23 town water systems in Brazoria County test for PFAS. 1 of them had at least one test above 4 ng/L, the new EPA limit for PFOA and PFOS. The highest single result was 4.4 ng/L of PFOS. No well in Brazoria County 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 Brazoria County
Is well water in Brazoria County safe to drink?
Most tested wells in Brazoria County came in under the limits. Of 2 health checks with enough tests, manganese came closest, at 0 of 20 wells over. Every well is different, so test yours for bacteria, nitrate and arsenic.
Can I get my well tested for free in Brazoria County?
Texas A&M AgriLife Extension's Texas Well Owner Network holds periodic county well water screenings, some free and some for a small per-sample fee. If not, use a lab Texas has certified for drinking water. Ask for bacteria, nitrate and arsenic, the tests that matter most in Brazoria County.
How deep are wells in Brazoria County?
Half the household wells here are shallower than 350 feet. Typical household wells here go deeper than in 172 of the 248 other Texas counties with enough drilling records.
How does Brazoria County compare with the counties around it?
For fluoride, the share of tested wells over the limit: Harris, the one neighbor with data, came in the same as Brazoria County, at 0% against 0%. Groundwater doesn't stop at county lines, so Harris's 0% is worth knowing about if you live near it.
How often should I test my well in Brazoria County?
Brazoria County has no public bacteria results for wells, so follow the CDC's advice: 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 Brazoria County numbers come from
- People on wells: 79,301 in Brazoria County, from EPA estimates built on the 2020 Census (Murray et al.).
- Lab tests: 60 well water samples from 20 wells in the Water Quality Portal, run by the USGS and EPA, 2012 to 2012.
- Well depths: 8,029 Texas drilling records for Brazoria County, gathered in the US Groundwater Well Database (Lin and others, 2024).
- Neighboring counties: the 5 counties that share a border with Brazoria County, from the Census Bureau's county adjacency file.
- PFAS: EPA tests of 23 town water systems in Brazoria County under the Fifth Unregulated Contaminant Monitoring Rule, 2023 to 2025.
- Radon: Brazoria County is zone 3 on the EPA Map of Radon Zones.
- State programs and links: Texas Water Development Board and Texas Commission on Environmental Quality (TCEQ), checked November 1, 2026.