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Harmony Grove, CA Tap Water Quality 2026

Water quality report for Harmony Grove, CA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Harmony Grove's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Rincon Del Diablo Mwd (id-1) PWSID: CA3710018 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS was sampled but not enough times for a compliance determination.

B

Harmony Grove earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS sampled, too few results to judge
No violations since 2015
No violations currently open
Harmony Grove's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of California utilities
Population Served
1989
~7430 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
None on record since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

✓ No violations on record for this water system.
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

No violations are on record for this system since 2015. EPA records violations for every community water system, so this reflects a clean compliance history rather than missing data.

About the Main Water System

Utility Rincon Del Diablo Mwd (Id-1)
PWSID CA3710018
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 1,989
Service connections 7,430
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Harmony Grove tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Harmony Grove water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to Harmony Grove? ▼
Rincon Del Diablo Mwd (Id-1) (PWSID CA3710018), one of 3 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-11-25. No significant deficiencies were recorded.

What Should Harmony Grove Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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