No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting October 2023.
Serves about 2,067 people (689 connections) with groundwater from its own wells.
From EPA's record for LA1029006. PurityMap is independent of Lake St John Waterworks District 1.
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43 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2023 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2023 | Haloacetic acids (HAA5) | 0.062 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2023 | Haloacetic acids (HAA5) | 65 µg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2023 | Total trihalomethanes (TTHM) | 91 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 0.089 mg/L | 0.080 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2023 | Haloacetic acids (HAA5) | 0.068 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2022 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2022 | Haloacetic acids (HAA5) | 0.063 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2022 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2022 | Haloacetic acids (HAA5) | 0.066 mg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2022 | Haloacetic acids (HAA5) | 0.067 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2021 | Haloacetic acids (HAA5) | 0.068 mg/L | 0.060 mg/L | Resolved |
| From September 2021 | Groundwater Rule | – | – | Resolved |
| Jul–Sep 2021 | Haloacetic acids (HAA5) | 0.068 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2021 | Haloacetic acids (HAA5) | 0.071 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2021 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2021 | Haloacetic acids (HAA5) | 0.069 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2020 | Haloacetic acids (HAA5) | 0.069 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2020 | Haloacetic acids (HAA5) | 0.074 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2020 | Haloacetic acids (HAA5) | 0.069 mg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2020 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2020 | Haloacetic acids (HAA5) | 0.07 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2019 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2019 | Haloacetic acids (HAA5) | 0.072 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2019 | Haloacetic acids (HAA5) | 0.062 mg/L | 0.060 mg/L | Resolved |
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 →Lake St John Waterworks District 1's phone number on EPA record is 318-757-3853. Its mailing address is LAKE ST JOHN WATERWORKS DISTRICT NO 1, 1185 HWY 569, FERRIDAY, LA 71334.
According to EPA's record, Lake St John Waterworks District 1 uses groundwater from its own wells.
EPA's record shows 43 health-based violations for Lake St John Waterworks District 1 in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting October 2023. EPA also lists 3 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 Lake St John Waterworks District 1'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 Lake St John Waterworks District 1. Its phone number on EPA record is 318-757-3853. Its mailing address on EPA record is LAKE ST JOHN WATERWORKS DISTRICT NO 1, 1185 HWY 569, FERRIDAY, LA 71334. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.