Public Water System

APTOS HILLS MUTUAL WATER CO

PWSID CA4400634 · California · 32 people served

Good

APTOS HILLS MUTUAL WATER CO is an EPA-regulated public water system in California (PWSID CA4400634). It serves an estimated 32 residents — a rural community of customers — across 1 community across 1 ZIP code.

Over the past five years, APTOS HILLS MUTUAL WATER CO has recorded 1 EPA health-based violation. The grade of B 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

Cities

ZIPs

Violations

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for APTOS HILLS MUTUAL WATER CO over the past five years of EPA SDWIS reporting.

Nitratechemical

EPA Code 1040 · Maximum Contaminant Level Exceedance

violation

EPA Limit

10 mg/L

Last Reading

10.05 MG/L

First Reported

Mar 2024

Most Recent

Mar 2024

What this violation means

Nitrate contamination is most acute in agricultural regions where fertilizer and animal waste leach into groundwater. The immediate risk is to formula-fed infants under 6 months — high nitrate levels prevent their blood from carrying oxygen, causing 'blue baby syndrome.' Pregnant women should also avoid high-nitrate water.

Recommended precautions

→Never give untreated high-nitrate water to infants — use bottled water for formula.
→Boiling does NOT remove nitrate. Boiling concentrates it.
→Reverse osmosis, ion exchange, or distillation are the only effective home treatments.
→Private well owners in farming areas should test annually for nitrate.

Read the complete guide to Nitrate

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 APTOS HILLS MUTUAL WATER CO

WATSONVILLE

ZIP Codes Served

95076

About this system

EPA records this system as PWSID CA4400634. 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 APTOS HILLS MUTUAL WATER CO directly or review their annual Consumer Confidence Report (CCR).