No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting July 2024.
Serves about 744 people (248 connections) with groundwater from its own wells, and buys water from City of Riesel.
From EPA's record for TX1550037. PurityMap is independent of M S WSC.
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37 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
| From July 2024 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From April 2024 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2024 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2023 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2023 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2023 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From April 2022 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From April 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2022 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From January 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2021 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2021 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From July 2021 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2021 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From April 2021 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2021 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From April 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2019 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2023 to December 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 123 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-30 to 2023-12-20 | UCMR5 Analytical Results: M S WSC (TX1550037) |
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 →M S WSC's phone number on EPA record is 254-896-5661. Its mailing address is 510 N MEMORIAL ST, RIESEL, TX 76682-3312.
According to EPA's record, M S WSC uses groundwater from its own wells, and buys water from City of Riesel.
EPA's record shows 37 health-based violations for M S WSC 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 July 2024. EPA also lists 17 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 M S WSC's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for M S WSC. Its phone number on EPA record is 254-896-5661. Its mailing address on EPA record is 510 N MEMORIAL ST, RIESEL, TX 76682-3312. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.