No health-based violations on EPA record since 2016.
Serves about 9,100 people (2,000 connections) with surface water bought from Rapid City.
From EPA's record for SD4680004. PurityMap is independent of Ellsworth Afb.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to January 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 9.96 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-02-13 to 2023-11-01 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2023-11-01 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2023-11-01 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| 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 | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2023-11-01 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2023-11-01 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-13 to 2024-01-31 | UCMR5 Analytical Results: ELLSWORTH AFB (SD4680004) |
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 →Ellsworth Afb's phone number on EPA record is 6053855395. Its mailing address is 2125 SCOTT DRIVE 28 CES/ CEOIU, ELLSWORTH AFB, SD 57706.
According to EPA's record, Ellsworth Afb uses surface water bought from Rapid City.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Ellsworth Afb's latest lead and copper round, which ended in December 2025, was 1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Ellsworth Afb. Its phone number on EPA record is 6053855395. Its mailing address on EPA record is 2125 SCOTT DRIVE 28 CES/ CEOIU, ELLSWORTH AFB, SD 57706. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.