Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 1,096 people (461 connections) with groundwater bought from Great Northwest Wholesale Water Commiss.
From EPA's record for MO1010510. PurityMap is independent of Maysville PWS.
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24 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 115 µg/L | 0.080 mg/L | Archived |
| Jan–Mar 2026 | Haloacetic acids (HAA5) | 105 µg/L | 0.060 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 114.4 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Haloacetic acids (HAA5) | 96.9 µg/L | 0.060 mg/L | Archived |
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 104.88 µg/L | 0.080 mg/L | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jul–Sep 2025 | Haloacetic acids (HAA5) | 78.15 µg/L | 0.060 mg/L | Archived |
| From November 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From October 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From September 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From September 2024 | Surface Water Treatment Rule | – | – | Resolved |
| From September 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2024 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2024 | Surface Water Treatment Rule | – | – | Resolved |
| From December 2022 | Chlorite | 1.2 mg/L | 1.0 mg/L | Resolved |
| Oct–Dec 2017 | Total trihalomethanes (TTHM) | 94 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2017 | Total trihalomethanes (TTHM) | 98 µg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2017 | Haloacetic acids (HAA5) | 61 µg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2017 | Total trihalomethanes (TTHM) | 96 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2017 | Haloacetic acids (HAA5) | 64 µg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2017 | Total trihalomethanes (TTHM) | 98 µg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2016 | Total trihalomethanes (TTHM) | 92 µg/L | 0.080 mg/L | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
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.
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Follow this water →Maysville PWS's phone number on EPA record is 816-284-0356. Its mailing address is 200 N CAMDEN, PO BOX 470, MAYSVILLE, MO 64469-0000.
According to EPA's record, Maysville PWS uses groundwater bought from Great Northwest Wholesale Water Commiss.
EPA's record shows 24 health-based violations for Maysville PWS in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting January 2026. EPA also lists 8 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Maysville PWS's latest lead and copper round, which ended in December 2025, was 4.42 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Maysville PWS. Its phone number on EPA record is 816-284-0356. Its mailing address on EPA record is 200 N CAMDEN, PO BOX 470, MAYSVILLE, MO 64469-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.