Public Water System

MARSHALL COUNTY RURAL WATER DISTRICT #2

PWSID OK1010848 · Oklahoma · 17,587 people served

Failing

MARSHALL COUNTY RURAL WATER DISTRICT #2 is an EPA-regulated public water system in Oklahoma (PWSID OK1010848). It serves an estimated 17,587 residents — a small city of customers — across 1 community across 1 ZIP code.

Over the past five years, MARSHALL COUNTY RURAL WATER DISTRICT #2 has recorded 111 EPA health-based violations. The grade of F summarizes this compliance pattern. Specific contaminants, dates, and rule citations are listed in the violation history below.

Service Area

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Centered on the averaged ZIP-code centroid of 1 ZIP served.

Population

17,587

Cities

ZIPs

Violations

111

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for MARSHALL COUNTY RURAL WATER DISTRICT #2 over the past five years of EPA SDWIS reporting.

Total Trihalomethanes (TTHMs)disinfectant

EPA Code 2950 · Maximum Contaminant Level Exceedance

111

violations

EPA Limit

0.08 mg/L

Last Reading

.095 MG/L

First Reported

Jan 2022

Most Recent

Jul 2025

What this violation means

Total Trihalomethanes (TTHMs) form when chlorine reacts with naturally occurring organic matter — leaves, soil, algae — in source water. They are among the most commonly reported violations because utilities pulling from surface water (rivers, lakes, reservoirs) struggle to balance disinfection with byproduct formation. Long-term exposure has been linked to bladder cancer and adverse pregnancy outcomes.

Recommended precautions

→Activated carbon filters (pitcher, faucet, or under-sink) effectively reduce TTHMs.
→Letting water sit uncovered allows TTHMs to off-gas — leave a pitcher in the fridge for several hours.
→Shower with the bathroom fan on; TTHMs can volatilize into the air during hot showers.
→Boiling reduces TTHMs through volatilization, but only after extended boiling.

Read the complete guide to Total Trihalomethanes (TTHMs)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Cities Served by MARSHALL COUNTY RURAL WATER DISTRICT #2

MADILL

ZIP Codes Served

73446

About this system

EPA records this system as PWSID OK1010848. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact MARSHALL COUNTY RURAL WATER DISTRICT #2 directly or review their annual Consumer Confidence Report (CCR).