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Water system · PWSID NC0235108

LAKE ROYALE S/D

DES PERES, MO · ~5,890 people served

Check your exact address → DES PERES overview
91
Excellent
PurityRadar safety score

PWSID

NC0235108

State

Missouri

City

DES PERES

Population served

5,890

Primary source

SWP

Score history

▼ 9 points — the score moved from 100 to 91 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 91

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 Mar 2024). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

4.1 ppt

limit 4 ppt

Above EPA limit · 1.0×

Violations & enforcement

85

Violations on record

0

Unaddressed

17

Health-based

231

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2025 Addressed
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2025 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2025 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2024 Resolved
Other · EPA contaminant 7000 began Jul 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2024 Resolved
Reporting · Lead & Copper Rule began Nov 2023 Addressed
Reporting · Lead & Copper Rule began Dec 2022 Resolved
Reporting · Lead & Copper Rule began Oct 2022 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Mar 2022 Resolved

Recent enforcement actions

  • State action · SIE Dec 2025
  • State action · SFJ Dec 2025
  • State action · SFL Dec 2025
  • State action · SOX Nov 2025
  • State action · SFL Oct 2025
  • State action · SFJ Oct 2025
  • State action · SIE Oct 2025
  • State action · SIF Jul 2025

This profile is built from EPA public records for system NC0235108 — 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.