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McNab, AR Tap Water Quality 2026

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

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

Main Utility: Southwest Arkansas Water System PWSID: AR0000889 Updated: 2026 Q2
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Lead above the federal action level

Lead is 23.00 ppb, 153% of the action level and no violations are open. PFAS has never been sampled at this system.

D

McNab earns a D for water quality

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

Lead: 23.00 ppb — 153% of the federal action level
PFAS never sampled at this system
30 violations since 2015, 28 health-based
No violations currently open
McNab's lead level vs. all Arkansas community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 23.00 ppb — 100% of the federal action level
✓ Lower lead than 3% of Arkansas utilities
Population Served
29
~892 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
30 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
23.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 23.00 ppb, 153% 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
Public Notice OTHER — — 2025 Addressed
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 61 UG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 71 UG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 72 UG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 91 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 97 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 104 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 94 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 90 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 93 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 93 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 108 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 104 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 134 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 115 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 120 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 101 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 98 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 116 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 124 UG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 138 UG/L 0.080 mg/L 2016 Resolved
Consumer Confidence Rule OTHER — — 2016 Resolved
TTHM MCL EXCEEDANCE 149 UG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 86 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 109 UG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 110 UG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 113 UG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 100 UG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 106 UG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 103 UG/L 0.080 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 28 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Southwest Arkansas Water System
PWSID AR0000889
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 29
Service connections 892
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is McNab tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 23.00 ppb, 153% of the action level.
Does McNab 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 McNab? ▼
Southwest Arkansas Water System (PWSID AR0000889). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-08-20. No significant deficiencies were recorded.

What Should McNab Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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