Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 235 people (94 connections) with groundwater bought from Saline County PWSD 2.
From EPA's record for MO2010029. PurityMap is independent of Arrow Rock PWS.
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15 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) | 88 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 88.1 µg/L | 0.080 mg/L | Archived |
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 85.68 µg/L | 0.080 mg/L | Archived |
| Jan–Mar 2025 | Total trihalomethanes (TTHM) | 81 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 82 µg/L | 0.080 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Apr–Jun 2020 | Total trihalomethanes (TTHM) | 87 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2020 | Total trihalomethanes (TTHM) | 93 µg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2019 | Total trihalomethanes (TTHM) | 98 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2019 | Total trihalomethanes (TTHM) | 82 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2019 | Total trihalomethanes (TTHM) | 88 µg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2018 | Total trihalomethanes (TTHM) | 90 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2018 | Total trihalomethanes (TTHM) | 87 µg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2018 | Total trihalomethanes (TTHM) | 87.5 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2018 | Total trihalomethanes (TTHM) | 82.7 µg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2017 | Total trihalomethanes (TTHM) | 82.2 µg/L | 0.080 mg/L | 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.
Get PurityMap updates about this water system.
Follow this water →Arrow Rock PWS's phone number on EPA record is 660-837-3608. Its mailing address is PO BOX 149, ARROW ROCK, MO 65320-0000.
According to EPA's record, Arrow Rock PWS uses groundwater bought from Saline County PWSD 2.
EPA's record shows 15 health-based violations for Arrow Rock 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 13 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Arrow Rock PWS's latest lead and copper round, which ended in December 2025, was 1.65 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Arrow Rock PWS. Its phone number on EPA record is 660-837-3608. Its mailing address on EPA record is PO BOX 149, ARROW ROCK, MO 65320-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.