No open health-based violations on EPA record in the last 10 years.
Serves about 4,500 people (1,538 connections) with groundwater from its own wells.
From EPA's record for SD4600043. PurityMap is independent of Black Hawk Water User District.
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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 |
|---|---|---|---|---|
| From February 2017 | Stage 1 Disinfectants and Disinfection Byproducts Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2025 to July 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| 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 | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-01 | UCMR5 Analytical Results: BLACK HAWK WATER USER DISTRICT (SD4600043) |
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 →Black Hawk Water User District's phone number on EPA record is 6057875777. Its mailing address is PO BOX 476, BLACK HAWK, SD 57718.
According to EPA's record, Black Hawk Water User District uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Black Hawk Water User District in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Black Hawk Water User District's latest lead and copper round, which ended in December 2023, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Black Hawk Water User District. Its phone number on EPA record is 6057875777. Its mailing address on EPA record is PO BOX 476, BLACK HAWK, SD 57718. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.