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Your Free Water Quality Report

Here's what's in your Aliso Viejo tap water

Based on the latest publicly reported testing for your water provider. Your water meets all federal legal standards; below are contaminants that sit above the stricter health guidelines — and where a home filter can help.

Provider: Moulton Niguel Water DistrictPeople served: 170,236Source: Purchased surface waterData period: 2013–2024EPA status: In compliance
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✓
Meets all federal legal standards
11
Contaminants above health guidelines
6
Highlighted in this report

Contaminants detected in your water

Shown as % of the federal legal limit, where one exists

Each figure is the average concentration reported for your utility. Where a federal limit exists, we show how close your water is to it; several common contaminants have no federal limit at all. A whole-home or reverse-osmosis system reduces most of these.

Total trihalomethanes (TTHMs)
49%of the legal limit
Detected in your water39.0 ppb
Federal legal limit80 ppb
Disinfection byproduct · linked to cancer
✓ Reduced by carbon filtration
Haloacetic acids (HAA5)
60%of the legal limit
Detected in your water36.2 ppb
Federal legal limit60 ppb
Disinfection byproduct · linked to cancer
✓ Reduced by carbon filtration
Chromium-6
No federal limit set
Detected in your water0.0749 ppb
Health guideline0.02 ppb
The “Erin Brockovich” compound · linked to cancer
✓ Reduced by reverse osmosis
Chloroform
No federal limit set
Detected in your water13.4 ppb
Health guideline0.4 ppb
Trihalomethane · linked to cancer
✓ Reduced by carbon filtration
Bromodichloromethane
No federal limit set
Detected in your water11.6 ppb
Health guideline0.06 ppb
Trihalomethane · linked to cancer
✓ Reduced by carbon filtration
Haloacetic acids (HAA9)
No federal limit set
Detected in your water13.6 ppb
Health guideline0.06 ppb
Disinfection byproduct · linked to cancer
✓ Reduced by carbon filtration

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About this report. Figures reflect the most recent publicly available water-quality testing for Moulton Niguel Water District, compiled from the California State Water Resources Control Board and the U.S. EPA, as published in the EWG Tap Water Database (data period 2013–2024). Percentages compare the detected level to the federal legal limit (MCL) where one exists; several contaminants shown have no federal limit. “Health guideline” refers to levels the Environmental Working Group considers protective of health, which are stricter than legal limits. This report reflects area-wide utility data and is not a test of the water at your individual tap. Irvine Water Filtration is an independent provider and is not affiliated with Moulton Niguel Water District. ppb = parts per billion, ppm = parts per million, ppt = parts per trillion, pCi/L = picocuries per liter.