Magnolia - Jackson Square
What EPA’s and CDC’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 825 people
- Connections
- 275
- Water source
- Groundwater bought from another system
- Based in
- St. Louis, LA
- County
- Lafayette Parish
- Owner
- Private
The ZIP code it serves
The short answer
Nothing in EPA’s and CDC’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 5 health-based violations since 2016.
What was found
Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, nitrate and uranium: 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.
Fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from March 26, 2012 to Jan. 30, 2018. Newer results are in the utility’s annual water quality report.
Below EPA’s limits3
Total trihalomethanes (TTHM)
Forms or is added in treatment
10.3ppb
Highest yearly average, 2020 to 2022
Averaged by year, the highest was 10.3 ppb, in 2022, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.7 ppb, in 2019.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Haloacetic acids (HAA5)
Forms or is added in treatment
5.0ppb
Highest yearly average, 2020 to 2022
2022 average: 3.9 ppb
Averaged by year, the highest was 5.0 ppb, in 2020, below EPA’s legal limit of 60 ppb. In 2022, the latest year on file, it averaged 3.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 5.2 ppb, in 2019.
What handles it
No certification claim covers this compound yet.
Fluoride
Forms or is added in treatment
0.22ppm
Highest yearly average, 2012 to 2018
2018, one sample: 0.2 ppm
Averaged by year, the highest was 0.22 ppm, in 2015, below EPA’s legal limit of 4.0 ppm. In 2018, the latest year on file, its one sample was 0.2 ppm.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Lead
- Nitrate
- Uranium
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 | May 18, 2023 | — | Resolved |
| Chlorine | Non-Acute MRDL | Jan. 1, 2022 to March 31, 2022 | — | Resolved |
| Chlorine | Non-Acute MRDL | Oct. 1, 2021 to Dec. 31, 2021 | — | Resolved |
| Chlorine | Non-Acute MRDL | July 1, 2021 to Sept. 30, 2021 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Nov. 8, 2019 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, nitrate and uranium results here are Louisiana’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride and chromium (total) come from EPA’s file alone, which ends in 2019. Magnolia - Jackson Square’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 didn’t sample this utility; CDC’s yearly averages for Louisiana cover 2020 to 2022; EPA’s compliance samples are from March 26, 2012 to Jan. 30, 2018.
Testing your own tap
The 3 labs Louisiana certifies closest to the area Magnolia - Jackson Square serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
SGS North America, Inc. - Scott
Scott, LA · about 5 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Element Materials Technology Lafayette, LLC
Lafayette, LA · about 9 miles
Certified for lead and copper, metals
LDH Central Laboratory
Baton Rouge, LA · about 61 miles
Certified for bacteria
Sources
- 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
- Certified labs: LDH, laboratories certified by Louisiana for drinking water analysis, read Oct. 16, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID LA1055101. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and CDC’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportMagnolia - Jackson Square 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
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded