CASTLE AIRPORT

MERCED, CA · ~1,650 people served

Check your exact address → MERCED overview

Excellent

PurityRadar safety score

PWSID

CA2410700

State

California

City

MERCED

Population served

1,650

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 85 Jun 18, 2026 · score 85

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

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2022. Official EPA record →

Reporting · EPA contaminant 5200 began Oct 2024 Unaddressed

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Unaddressed

Monitoring · Lead & Copper Rule began Oct 2021 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2021 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2021 Resolved

Monitoring · Lead & Copper Rule began Nov 2017 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jan 1994 Resolved

Max contaminant level (MCL) · Total coliform health-based began Mar 1993 Resolved

Recent enforcement actions

State action · SOX Aug 2022
State action · SFL Mar 2022
State action · SOX Jan 2022
State action · SFL Jan 2022
State action · SOX Jan 2019
State action · SOX Oct 2018
State action · SFJ Feb 2018
State action · SOX May 1993

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest Apr 2021

4.81 · max 4.81 mg/l as N · 2

Arsenic

1 station · latest Apr 2021

3.6 · max 3.6 ug/l · 1

Fluoride

1 station · latest Apr 2021

0.15 · max 0.15 mg/l · 1

Lead

1 station · latest Apr 2021

0.087 · max 0.087 ug/l · 1

Uranium

1 station · latest Apr 2021

0.556 · max 0.556 ug/l · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CA2410700 — 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.