No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting April 2020.
Serves about 4,280 people (1,712 connections) with groundwater from its own wells.
From EPA's record for SD4600866. PurityMap is independent of Sioux Rural Water System.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Apr–Jun 2020 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from June 2023 to March 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 52.2 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 | 2023-06-12 to 2023-12-04 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-04 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-04 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| 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 | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-04 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-04 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-03-11 | UCMR5 Analytical Results: SIOUX RURAL WATER SYSTEM (SD4600866) |
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 →Sioux Rural Water System's phone number on EPA record is 6058821321. Its mailing address is 45703 176TH STREET, WATERTOWN, SD 57201.
According to EPA's record, Sioux Rural Water System uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Sioux Rural Water System 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 April 2020. EPA also lists 3 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Sioux Rural Water System's latest lead and copper round, which ended in December 2025, was 4 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Sioux Rural Water System. Its phone number on EPA record is 6058821321. Its mailing address on EPA record is 45703 176TH STREET, WATERTOWN, SD 57201. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.