Water in Alabama.
Alabama relies heavily on river-system surface water in the south and karst-aquifer groundwater in the north. Disinfection byproducts (TTHMs) consistently appear above EWG guidelines across the state. Industrial PFAS contamination from the Decatur area is among the most studied in the Southeast.
Decatur's 3M plant fueled one of the largest PFAS contamination zones in the country.
How Alabama regulates drinking water.
Tracks federal SDWA standards. No state-specific MCLs stricter than EPA. PFAS enforcement is reactive to federal action.
Alabama Department of Environmental Management
Alabama's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2016
3M and Daikin Decatur PFAS contamination identified in West Morgan-East Lawrence water supply.
- 2019
$35M settlement reached between 3M and Decatur-area water authority over PFAS.
- 2023
State legislature considers but does not pass PFAS-specific drinking water limits.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Alabama's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- riverMobile-Tombigbee River Basin
Coastal South Alabama's primary surface supply.
- riverTennessee River
North Alabama and TVA-served communities.
- riverCoosa-Alabama River
Central state including Birmingham and Montgomery.
- aquiferChickasaw Aquifer
Eutaw and Selma chalk groundwater for west-central AL.
Source-water mix
~55% surface water, ~45% groundwater
Major cities served
Birmingham · Mobile · Montgomery · Huntsville · Tuscaloosa
Who actually serves the water.
The largest public water systems in Alabama by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Birmingham Water Works BoardBirmingham770Kserved
- Mobile Area Water and Sewer SystemMobile280Kserved
- Huntsville UtilitiesHuntsville220Kserved
- Montgomery Water WorksMontgomery200Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Alabama's drinking water systems.
Decatur's 3M and Daikin plants drove decades of PFAS contamination in the Tennessee River corridor. Birmingham's steel and coke legacy left heavy-metal-contaminated groundwater. Statewide agricultural runoff (poultry and row crops) drives nitrate exposure in the Coastal Plain.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
Risk isn't evenly distributed.
Households on the West Morgan-East Lawrence water authority near Decatur face the most-documented PFAS exposure. Rural well users statewide have no testing requirement.
~15% of households rely on private wells, predominantly rural and unregulated.
What's coming for Alabama's water.
Coastal Alabama faces accelerating saltwater intrusion threatening Mobile-area aquifers. Increased intensity of Gulf hurricanes disrupts surface-water treatment and can overload combined sewer systems. North Alabama drought cycles strain reservoir storage on the Coosa system.
Voluntary statewide
Alabama Department of Public Health provides voluntary school lead-testing guidance, but participation is not mandated. Fewer than 20% of districts have published full results.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Alabama specifically.
- 1
Has my utility completed sampling for the six federally regulated PFAS compounds yet?
- 2
What is the most recent TTHM running annual average for my system?
- 3
Does my utility participate in voluntary lead-in-water sampling at schools and daycares?
- 4
Where do I file a complaint if I see violations not appearing in my Consumer Confidence Report?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
What's changed in Alabama water law.
Drinking water regulation moves at the state level as much as the federal level. Below are notable recent bills and regulatory actions specific to Alabama.
- 2023
SB 137 — Lead Service Line Inventory Funding (passed; provides match to federal IIJA funds).
- 2022
Attempted PFAS drinking water standard legislation did not pass.
For PFAS in the Decatur corridor, look for NSF/ANSI P473 or reverse osmosis. For TTHMs statewide, NSF/ANSI 53 carbon block works well.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Alabama