Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 963 people (321 connections) with groundwater from its own wells.
From EPA's record for LA1031029. PurityMap is independent of South Desoto Water System.
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40 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 0.127 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 0.126 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 0.133 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2025 | Total trihalomethanes (TTHM) | 0.143 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2025 | Total trihalomethanes (TTHM) | 0.148 mg/L | 0.080 mg/L | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2024 | Total trihalomethanes (TTHM) | 0.154 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2024 | Total trihalomethanes (TTHM) | 0.149 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2024 | Total trihalomethanes (TTHM) | 0.162 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2024 | Total trihalomethanes (TTHM) | 0.167 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2023 | Total trihalomethanes (TTHM) | 0.161 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2023 | Total trihalomethanes (TTHM) | 0.182 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2023 | Total trihalomethanes (TTHM) | 0.193 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 0.202 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2022 | Total trihalomethanes (TTHM) | 0.221 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2022 | Total trihalomethanes (TTHM) | 0.232 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2022 | Total trihalomethanes (TTHM) | 0.19 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2022 | Total trihalomethanes (TTHM) | 0.171 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2021 | Total trihalomethanes (TTHM) | 0.125 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2021 | Total trihalomethanes (TTHM) | 0.101 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2021 | Total trihalomethanes (TTHM) | 0.126 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2021 | Total trihalomethanes (TTHM) | 0.144 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2020 | Total trihalomethanes (TTHM) | 0.171 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 0.17 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2020 | Total trihalomethanes (TTHM) | 0.171 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2020 | Total trihalomethanes (TTHM) | 0.166 mg/L | 0.080 mg/L | Archived |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →South Desoto Water System's phone number on EPA record is 318-773-9702. Its mailing address is South DeSoto Water System, P.O. Box 1487, MANSFIELD, LA 71052.
According to EPA's record, South Desoto Water System uses groundwater from its own wells.
EPA's record shows 40 health-based violations for South Desoto Water System in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting January 2026. EPA also lists 20 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in South Desoto Water System's latest lead and copper round, which ended in December 2024. The federal action level is 15 µg/L.
PurityMap has no verified website for South Desoto Water System. Its phone number on EPA record is 318-773-9702. Its mailing address on EPA record is South DeSoto Water System, P.O. Box 1487, MANSFIELD, LA 71052. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.