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Arrow Rock, MO Tap Water Quality 2026

Water quality report for Arrow Rock, MO — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Arrow Rock's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Arrow Rock Pws PWSID: MO2010029 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.65 ppb, 11% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Arrow Rock earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 1.65 ppb — 11% of the federal action level
PFAS never sampled at this system
30 violations since 2015, 15 health-based
No violations currently open
Arrow Rock's lead level vs. all Missouri community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.65 ppb — 11% of the federal action level
✓ Lower lead than 64% of Missouri utilities
Population Served
50
~94 connections
Water Source
Groundwater
Purchased groundwater from another system — SDWIS source code GWP
Active Violations
0
30 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
11% of EPA action level
1.65 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.65 ppb, 11% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MCL EXCEEDANCE 88 UG/L 0.080 mg/L 2026 Archived
TTHM MCL EXCEEDANCE 88.1 UG/L 0.080 mg/L 2025 Archived
Public Notice OTHER — — 2025 Resolved
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Unaddressed
TTHM MCL EXCEEDANCE 85.68 UG/L 0.080 mg/L 2025 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
TTHM MCL EXCEEDANCE 81 UG/L 0.080 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2020 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 82 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 87 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 93 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 98 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 82 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 88 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 90 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 87 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 87.5 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 82.7 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 82.2 UG/L 0.080 mg/L 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

30 violations are on record since 2015, of which 15 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Arrow Rock Pws
PWSID MO2010029
Water source Groundwater — Purchased groundwater from another system — SDWIS source code GWP
Population served 50
Service connections 94
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Arrow Rock tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.65 ppb, 11% of the action level.
Does Arrow Rock water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Arrow Rock? ▼
Arrow Rock Pws (PWSID MO2010029), one of 2 systems serving this area. Groundwater. Purchased groundwater from another system — SDWIS source code GWP
When was this system last inspected? ▼
It was last inspected on 2023-07-11. No significant deficiencies were recorded.

What Should Arrow Rock Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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