ESCONDIDO, California Tap Water Quality

171,869 people served · 6 water systems

Good

ESCONDIDO, California is a mid-sized community with 171,869 residents served by a network of 6 public water systems. Water service covers ZIP codes 92026, 92027, 92029, 92539.

ESCONDIDO's water utilities have recorded a small number of EPA health-based violations in the last five years. These were resolved through standard corrective action.

EPA reporting identifies Uranium among the regulated contaminants associated with ESCONDIDO's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

92026 92027 92029 92539

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving ESCONDIDO. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Uraniumradiological

EPA Code 4006 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.03 mg/L

Last Reading

38.4 PCI/L

First Reported

Jan 2024

Most Recent

Jan 2024

What this violation means

Uranium in drinking water is both a chemical toxin (kidney damage) and a radiological hazard (increased cancer risk). It's most commonly found in groundwater near uranium ore deposits or former mining activity in the Western US.

Recommended precautions

→Reverse osmosis is the gold standard for removing uranium.
→Ion exchange systems work but must be sized correctly for uranium.
→If you live near former mining sites, test for uranium even if not required.

Read the complete guide to Uranium

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.

Water Systems Serving ESCONDIDO

RINCON DEL DIABLO MWD (ID-1)

PWSID: CA3710018

30,757 served

RINCON DEL DIABLO MWD (ID-A)

PWSID: CA3710044

3,275 served

OAKVALE PARK

PWSID: CA3700962

260 served

2 violations

ANZA RV RESORT

PWSID: CA3301355

203 served

ESCONDIDO, CITY OF

PWSID: CA3710006

137,044 served

DEL DIOS MUTUAL WATER COMPANY

PWSID: CA3700866

330 served

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is ESCONDIDO, California tap water safe to drink?▼

This city's water had minor EPA violations in the last 5 years.

How many EPA violations does ESCONDIDO have?▼

ESCONDIDO has 2 EPA health-based water violations in the last 5 years across 6 water systems serving 171,869 people.

What contaminants have been found in ESCONDIDO water?▼

The following EPA-regulated contaminants have been detected: 4006. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in ESCONDIDO?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in ESCONDIDO?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.