City of Winnsboro Water System
What EPA’s and CDC’s records show in this utility’s water: PFAS and lithium; nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 7,518 people
- Connections
- 2,506
- Water source
- Groundwater
- Based in
- Winnsboro, LA
- County
- Franklin Parish
- Owner
- Local government
The ZIP code it serves
The short answer
1 result is above the health goal. The worst: Arsenic, above the health goal. 11 health-based violations since 2016.
What handles itWhat was found
PFAS and lithium: EPA UCMR 5, samples taken from Nov. 19, 2024 to July 9, 2025.
Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Louisiana’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2022, with EPA’s 2012 to 2019 file for earlier years.
Arsenic, fluoride, chromium (total) and uranium: EPA’s compliance monitoring file, samples taken from Jan. 7, 2013 to Nov. 26, 2018. Newer results are in the utility’s annual water quality report.
PFAS: None of the six PFAS in EPA’s 2024 drinking water rule was found in this utility’s samples. None of the other 23 PFAS tested for was found either.
EPA’s 2024 PFAS rule, compound by compound
| PFAS | EPA’s limit | Result |
|---|---|---|
| PFOA | 4.0 ppt | Not foundNot found in any of 2 samples, below 4 ppt |
| PFOS | 4.0 ppt | Not foundNot found in any of 2 samples, below 4 ppt |
| PFHxS | 10 ppt | Not foundNot found in any of 2 samples, below 3 ppt |
| PFNA | 10 ppt | Not foundNot found in any of 2 samples, below 4 ppt |
| HFPO-DA (GenX) | 10 ppt | Not foundNot found in any of 2 samples, below 5 ppt |
| PFBS | Index only | Not foundNot found in any of 2 samples, below 3 ppt |
| Hazard IndexPFHxS, PFNA, HFPO-DA and PFBS together | 1 | Doesn’t applyDoesn’t apply: no sampling location found two or more of the four |
| Results from EPA’s UCMR 5 sampling. “Below” is the lab’s reporting level: a result under it reads as not found, which is not the same as zero. The limits are EPA’s 2024 rule, with compliance due from 2029; EPA has since proposed changes to some of them, explained on each compound’s page. PFBS has no limit of its own and counts only toward the Hazard Index, which adds up the four, each against EPA’s health-based level, from each sampling location’s average, as EPA’s UCMR 5 summary does. It counts only where two or more of the four were found, and is above the limit from 1.5. | ||
Above the health goal1
Arsenic
Comes from the source
1.4ppb
Highest yearly average, 2013 to 2018
Averaged by year, the highest was 1.4 ppb, in 2018: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 1.9 ppb. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
- NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
Below EPA’s limits5
Nitrate
Comes from the source
1.7ppm
Highest yearly average, 2021 to 2022
Averaged by year, the highest was 1.7 ppm, in 2022, below EPA’s legal limit of 10 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.4 ppm, in 2019.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Total trihalomethanes (TTHM)
Forms or is added in treatment
8.3ppb
Highest yearly average, 2020 to 2022
2022 average: 4.5 ppb
Averaged by year, the highest was 8.3 ppb, in 2021, below EPA’s legal limit of 80 ppb. In 2022, the latest year on file, it averaged 4.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.1 ppb, in 2014.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Fluoride
Forms or is added in treatment
0.24ppm
Highest yearly average, 2013 to 2018
2018 average: 0.19 ppm
Averaged by year, the highest was 0.24 ppm, in 2016, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.27 ppm. In 2018, the latest year on file, its five samples averaged 0.19 ppm.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Haloacetic acids (HAA5)
Forms or is added in treatment
2.1ppb
Highest yearly average, 2020 to 2022
Averaged by year, the highest was 2.1 ppb, in 2022, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.5 ppb, in 2013.
What handles it
No certification claim covers this compound yet.
Chromium (total)
Comes from the source
2.4ppb
Highest yearly average, 2013 to 2018
Averaged by year, the highest was 2.4 ppb, in 2018, below EPA’s legal limit of 100 ppb. Its highest single sample was 6.1 ppb. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
32 compounds tested and not foundIncluding all six PFAS in EPA’s 2024 rule. Below the reporting level in every sample. Not found is not the same as zero.
From routine monitoring
- Lead
- Uranium
PFAS and lithium, from EPA’s UCMR 5 sampling
- 11Cl-PF3OUdS
- 4:2 FTS
- 6:2 FTS
- 8:2 FTS
- 9Cl-PF3ONS
- ADONA
- HFPO-DA (GenX)
- Lithium
- NEtFOSAA
- NFDHA
- NMeFOSAA
- PFBA
- PFBS
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxA
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOA
- PFOS
- PFPeA
- PFPeS
- PFTA
- PFTrDA
- PFUnA
What handles it
A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”
- NSF/ANSI 53
Claim: Arsenic (Pentavalent)<=50 ppb Reduction
For: Arsenic
Other certifiers’ wording: Arsenic (III) (50 ppb influent level)
- NSF/ANSI 58
Claim: Arsenic (Pentavalent)<=50 ppb Reduction
For: Arsenic
Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)
At the tap, or for the whole house?
These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.
Filters with those claims on a certifier’s listing
Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Disinfectant
City of Winnsboro Water System reported disinfecting with chlorine, not chloramine, at its one sampling point, in its 2024 to 2025 sampling for EPA.
Chlorine leaves water that sits out for a few days, CDC says. A filter certified for it carries a chlorine claim under NSF/ANSI 42; a shower filter, a free chlorine claim under NSF/ANSI 177. This is what the utility reported for that sampling. Its annual water quality report says what it uses now.
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Oct. 1, 2025 | — | Unaddressed |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | May 1, 2025 | — | Unaddressed |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | May 1, 2025 | — | Unaddressed |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | May 1, 2025 | — | Unaddressed |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | May 1, 2025 | — | Unaddressed |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Sept. 6, 2022 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 6 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Louisiana’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Arsenic, fluoride, chromium (total) and uranium come from EPA’s file alone, which ends in 2019. City of Winnsboro Water System’s own annual report, which it must send you every year, has newer results for those and the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 samples are from Nov. 19, 2024 to July 9, 2025; CDC’s yearly averages for Louisiana cover 2020 to 2022; EPA’s compliance samples are from Jan. 7, 2013 to Nov. 26, 2018.
Testing your own tap
No lab Louisiana certifies is within 75 miles of the area City of Winnsboro Water System serves on the state’s list. Some take samples by mail; the state’s page lists them all.
All 48 certified labs for LouisianaSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- CDC Environmental Public Health Tracking Network, yearly averages Louisiana supplied to CDC, 2020 to 2022, read Oct. 8, 2026. TapBuff’s comparisons with EPA’s limits are its own, not CDC’s or Louisiana’s.
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Disinfectant: EPA UCMR 5 occurrence data, additional data elements, file of Oct. 15, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID LA1041006. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on ArsenicWhat each one does to health, where it comes from, and the certification claim that addresses it.About Arsenic
- Get the utility’s own reportCity of Winnsboro Water System must send you a water quality report every year. It covers contaminants this page does not show, and has newer results than EPA’s national file for the ones here that come from it.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs