Highlights state plant, distribution-system, and treatment-optimization awards earned in 2021.
Since You Asked
Huntsville Water Quality Reports, Demystified
What's in Huntsville's drinking water? Eight annual reports show water that met applicable standards, extensive monitoring, and award-winning operations — along with forever-chemical results residents deserve to understand clearly.
TL;DR — What residents should know
You do not need a science background to understand the main findings. PFAS, PFOA, and PFOS are defined below.
No contaminant-limit violations reported
All eight reports say Huntsville's drinking water met the federal and state requirements that applied during the reporting period.
Extensive bacteria monitoring
Huntsville Utilities reports taking at least 150 distribution-system samples each month. Occasional positive indicator samples were followed by negative repeat tests.
One PFOS result deserves follow-up
One 2023 location averaged 7.7 parts per trillion, above the new 4-parts-per-trillion federal limit. EPA says this monitoring result alone is not a violation finding.
“Forever chemicals”: a location-specific picture
EPA's official monitoring file provides the detail missing from a systemwide maximum. The charts below use EPA's 2023 average at each sampling location for the five points where water enters Huntsville's distribution system. Results shown as “below reporting level” were too low for the monitoring program to report as a measured amount. The comparison with the 4-parts-per-trillion PFOA and PFOS standard is for context only: EPA says these monitoring results do not determine compliance or noncompliance.
PFOS averages
2023, parts per trillion. “< reporting level” means the amount was too low to report as a measured result.
Federal limit: 4 parts per trillion
PFOA averages
2023, parts per trillion. “< reporting level” means the amount was too low to report as a measured result.
Federal limit: 4 parts per trillion
Three surface-water entry points were below reporting levels for both compounds
In EPA's 2023 nationwide monitoring program, South Parkway, Southwest, and Southeast were below the reporting level for both PFOA and PFOS. Williams Well averaged 2.35 parts per trillion for PFOA and was below the reporting level for PFOS. Lincoln-Dallas was below the reporting level for PFOA and averaged 7.7 parts per trillion for PFOS. EPA has proposed giving eligible water systems more time to meet the 4-parts-per-trillion limits, but that proposal is not yet final.
A reporting detail worth correcting
The 2025 and 2026 reports show an average PFOA amount of 13 parts per trillion, while the highest number in the same row is only 2.9 parts per trillion. An average cannot be higher than the maximum, so both figures cannot be correct. EPA's underlying monitoring file provides results by location. A corrected summary from Huntsville Utilities would make the public report easier to verify and understand.
Bacteria monitoring: what the reports establish
Huntsville Utilities says it takes at least 150 samples each month from pipes throughout the distribution system. The samples are checked for total coliform, a broad group of usually harmless bacteria used as an early warning that other germs might be present. Occasional positive samples triggered follow-up testing, the required repeat samples were negative, and the monthly threshold was not exceeded. The reports identify no total-coliform or E. coli violation. A total-coliform result is not automatically E. coli, proof of sewage, or evidence of a sewer leak.
Recurring metrics: good results and useful cautions
| Metric | What the reports show | How to read it |
|---|---|---|
| Byproducts of disinfection Total trihalomethanes (TTHM) and five haloacetic acids (HAA5) | These chemicals can form when disinfectants react with natural material in water. They were detected year after year, but Huntsville's reported annual averages remained below the legal limits. | Meets reported limits; continue tracking |
| Lead | Low reported results with no action-level exceedance. The Alabama Department of Environmental Management (ADEM) May 2025 inventory summary, which ADEM says remains under review, lists 0 lead lines, 1 galvanized-requiring-replacement connection, 0 unknown, and 106,347 non-lead. | No contradiction: “galvanized requiring replacement” is a separate category |
| Cloudiness “Turbidity” in the mailed reports | Cloudiness is monitored because excessive particles can make disinfection less effective. The reports identify no treatment violation. | Treatment performance met requirements |
| Organisms in untreated source water Cryptosporidium and Giardia | These organisms were detected in untreated river or well water. The reports explicitly say this does not mean Cryptosporidium was present in finished drinking water. | Source-water concern, not a tap-water finding |
| “Forever chemicals” PFAS, including PFOA and PFOS | EPA's 2023 data shows three surface-water entry points below reporting levels for both chemicals, a 2.35-parts-per-trillion PFOA average at Williams Well, and a 7.7-parts-per-trillion PFOS average at Lincoln-Dallas. | Results by location matter |
The awards reflect sustained operational performance
Huntsville Utilities has repeatedly earned plant, distribution-system, optimization, and broader utility-performance awards. Those honors are meaningful evidence of operational achievement. They are not a contaminant-by-contaminant health finding or a certification of the City's sanitary-sewer system.
Highlights 2022 best-operated plant recognition at three facilities and for the distribution system.
Highlights a national 2024 Gold Award and a third consecutive state distribution-system award.
Highlights 2025 state and regional recognition for Southwest, Lincoln-Dallas, and South Parkway.
What this says about the Aldridge Creek concern
What the reports can establish
- Huntsville uses surface water and groundwater sources.
- The utility monitors raw water, treatment performance, and the distribution system.
- Raw-source organism results are reported separately from finished drinking water.
- Finished drinking water met the standards reported for these years.
What the reports cannot establish
- That the Aldridge Creek film was sewage.
- That a sanitary-sewer overflow occurred at Green Cove Road.
- That total coliform came from a sewer leak.
- That finished tap water contained Cryptosporidium or Giardia.
Resident observations about odor, surface film, aging pipes, and possible sewer leakage deserve targeted dry-weather sampling, inspection records, overflow reports, and laboratory results. Annual drinking-water reports cannot answer a sanitary-sewer question by themselves.
Definitions: PFAS, PFOA, and PFOS
Per- and polyfluoroalkyl substances (PFAS) are a large family of long-lasting, human-made chemicals. They are often called “forever chemicals” because they break down very slowly.
- Perfluorooctanoic acid (PFOA)
- One specific chemical in the PFAS family.
- Perfluorooctanesulfonic acid (PFOS)
- Another specific chemical in the PFAS family.
EPA has established a separate drinking-water limit for PFOA and PFOS. The amounts are shown in parts per trillion—one part of a chemical for every trillion parts of water.
Useful next steps for public understanding
- Keep the location detail public. Include sampling-point averages and sample dates in future annual reports, not only systemwide ranges.
- Correct the PFOA summary row. Explain how a reported 13-parts-per-trillion average can appear beside a maximum of only 2.9 parts per trillion, and reconcile the row with EPA's underlying records.
- Make bacteria summaries downloadable. Publish monthly totals, repeat results, and any corrective steps in a simple spreadsheet alongside the compliance conclusion.
- Map the water sources. Explain which neighborhoods may receive water from each Huntsville plant or Limestone County's Turner plant and how blending changes.
- Publish the source-water assessment. The reports say it is available by appointment; residents should be able to review it online.
- Explain the PFAS plan. Tell customers how current monitoring relates to EPA's 4-parts-per-trillion limits and whether treatment changes are anticipated.
Read the reports yourself
Report years are one year later than their principal testing years. Some tables also contain older results because not every contaminant is monitored annually.
- Huntsville Utilities — official publications archive
- U.S. EPA — PFAS drinking-water regulation
- U.S. EPA — nationwide unregulated-contaminant monitoring data and guidance
- U.S. EPA — proposed PFOA/PFOS compliance extension rule
- ADEM — Alabama service-line inventory submissions
- Association of Metropolitan Water Agencies — Huntsville Utilities 2024 Gold Award
Have a source or correction?
Send the public record, sampling result, or technical correction. This page will be updated when new evidence clarifies the record.