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Water system · PWSID MO2024499

RALLS COUNTY PWSD 1

HANNIBAL, MO · ~7,662 people served

Check your exact address → HANNIBAL overview
90
Excellent
PurityRadar safety score

PWSID

MO2024499

State

Missouri

City

HANNIBAL

Population served

7,662

Primary source

Groundwater

Score history

▼ 10 points — the score moved from 100 to 90 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 90

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Aug 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.3 ppt

limit 4 ppt

Above EPA limit · 1.1×

Lithium

14,200 ppt

limit —

No federal limit

PFBA

70 ppt

limit —

No federal limit

PFBS

11 ppt

limit —

No federal limit

Violations & enforcement

11

Violations on record

0

Unaddressed

9

Health-based

41

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2023. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2023 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2020 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2020 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2020 Resolved
Monitoring · Lead & Copper Rule began Apr 2017 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2017 Resolved
Monitoring & reporting · Total coliform began May 2013 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2005 Resolved

Recent enforcement actions

  • State action · SIF Jul 2023
  • State action · SIE Jun 2023
  • State action · SFJ Jun 2023
  • State action · SOX May 2023
  • State action · SIF Apr 2023
  • State action · SFJ Mar 2023
  • State action · SIE Mar 2023
  • State action · SIF Jan 2023

This profile is built from EPA public records for system MO2024499 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.