No health-based violations on EPA record since 2016.
Serves about 9,690 people (4,364 connections) with surface water from its own intake.
From EPA's record for CO0151750. PurityMap is independent of St Charles Mesa WD.
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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 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 25 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 | 2025-02-18 to 2025-08-05 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-18 to 2025-08-05 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-18 to 2025-08-05 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| 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 | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-18 to 2025-08-05 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-18 to 2025-08-05 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-26 to 2025-08-26 | UCMR5 Analytical Results: ST CHARLES MESA WD (CO0151750) |
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 →St Charles Mesa WD's phone number on EPA record is 719-542-4380. Its mailing address is 1397 S ASPEN RD, PUEBLO, CO 81006.
According to EPA's record, St Charles Mesa WD uses surface water from its own intake.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in St Charles Mesa WD's latest lead and copper round, which ended in December 2025, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for St Charles Mesa WD. Its phone number on EPA record is 719-542-4380. Its mailing address on EPA record is 1397 S ASPEN RD, PUEBLO, CO 81006. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.