Malden PWS
Published drinking-water records and contacts for Malden PWS. System MO4010490. Review sources and dates; not a real-time water assessment.
- System ID
- MO4010490
- State or territory
- MO
- Published population served
- 3706
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 180 — 2023-03-22 – 2024-03-26
- Lead and copper monitoring summaries: 25 — 1992-07-01 – 2024-12-31
- Missouri DNR PFAS samples — non-UCMR classes: 174 — 2023-03-22 – 2024-03-26
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2024-03-26 | Malden PWS / TP10808 |
| lithium | 62.8 µg/L | 9 µg/L | 2024-02-14 | Malden PWS / TP10808 |
Download all EPA UCMR 5 records (CSV)
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.00246 mg/L | 2022-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0.00133 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0.00133 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0.00133 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2016-01-01 – 2018-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2016-01-01 – 2018-12-31 | 2026Q3 |
| Lead (PB90) | 0.00432 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| NETFOSAA | < 5 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUORONONANOIC ACID (PFNA) | < 4 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| 9CL-PF3ONS | < 2 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROHEPTANOIC ACID (PFHPA) | < 3 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROHEXANE SULFONIC ACID (PFHxS) | < 3 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROHEPTANESULFONIC ACID (PFHPS) | < 3 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROPENTANOIC ACID (PFPEA) | < 3 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| 11CL-PF3OUDS | < 5 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROBUTANOIC ACID (PFBA) | < 5 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| PERFLUOROTETRADECANOIC ACID (PFTA) | < 8 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| NONAFLUORO NFDHA | < 20 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
| NMEFOSAA | < 6 NG/L | 2024-03-26 | WELL # 4 / Missouri DNR PFAS samples — non-UCMR classes |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
8 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Revised Total Coliform Rule / Maximum Contaminant Level Violation, E. coli (RTCR) | 2025-09-01 – 2025-09-30 | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule Revisions / Notification, Known or Potential LSL | 2025-07-02 – — | Unaddressed | No | 2026Q3 |
| Lead and Copper Rule / Lead Consumer Notice | 2024-10-01 – — | Unaddressed | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2020-07-01 – — | Resolved | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2019-07-01 – — | Resolved | No | 2026Q3 |
| Total Coliform Rule / Monitoring, Routine Minor (TCR) | 1996-11-01 – 1996-11-30 | Archived | No | 2026Q3 |
| Total Coliform Rule / Monitoring, Routine Major (TCR) | 1991-05-01 – 1991-05-31 | Archived | No | 2026Q3 |
| Total Coliform Rule / Monitoring, Routine Major (TCR) | 1991-04-01 – 1991-04-30 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- Missouri DNR PFAS samples — non-UCMR classes — last successful check: 2026-10-15
Administrative contact (EPA filing)
Kooyman, Denton: 573-276-4502
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.