Mobile County Water Quality: 2 Cities Ranked by the Records
Mobile County, Alabama: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Perfluorooctanoic acid (PFOA)Detected in 1 system of 2 tested4.0 ng/L federal MCL (2024) · US EPAHighest31.4 ng/L
- GRAND BAY WATER WORKS BOARD31.4 ng/LSample date: 2024-08-12 to 2025-04-08
- MOBILE, BD. OF W&S COMM. OF THE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-04 to 2025-08-18
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 2 tested4.0 ng/L federal MCL (2024) · US EPAHighest26.9 ng/L
- GRAND BAY WATER WORKS BOARD26.9 ng/LSample date: 2024-08-12 to 2025-04-08
- MOBILE, BD. OF W&S COMM. OF THE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-04 to 2025-08-18
Lead (90th percentile)Detected in 1 system of 2 tested15 µg/L federal action level · US EPAHighest1.5 µg/L
- MOBILE, BD. OF W&S COMM. OF THE CITY OF1.5 µg/LMonitoring period: 2025–2025
- GRAND BAY WATER WORKS BOARDNot detectedMonitoring period: 2023–2025
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest2.6 gpg
- MOBILE, BD. OF W&S COMM. OF THE CITY OF2.6 gpgReporting year: 2025
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest4.4 ng/L
- GRAND BAY WATER WORKS BOARD4.4 ng/LSample date: 2024-08-12 to 2025-04-08
- MOBILE, BD. OF W&S COMM. OF THE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-04 to 2025-08-18
27 substances tested, none detected in any systemShow
Tested in these 2 systems: GRAND BAY WATER WORKS BOARD, MOBILE, BD. OF W&S COMM. OF THE CITY OF
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lithium
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 2 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in Alabama1city reports hardness · Mobile, 2.6 gpg
None above 7 gpg, the USGS threshold for hard water. An aesthetic measure with no federal health limit.
Hard water explainedLargest water systems
Frequently asked
How does Mobile County tap water compare across cities?
PurityMap ranks 2 cities in Mobile County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Mobile's main water system: MOBILE, BD. OF W&S COMM. OF THE CITY OF · PWSID AL0001005 · Purity Score 97 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Mobile County cities had a PFAS sample above a 2024 EPA limit?
1 of 2 Mobile County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Grand Bay (PFOA 31.4 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.
Is there lead in Mobile County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 2 Mobile County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Does Mobile County have hard water?
Hardness is published in utility water-quality reports for 1 Mobile County city on record; the hardest is Mobile at 2.6 grains per gallon. Hardness affects scale and appliances; it is not a health finding.
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