Source water assessments
Water sources are assessed regularly to examine potential pollutant sources in the area. This does not mean contaminants are actively being discharged into these water sources. Rather, these surveys are used to evaluate the vulnerability of water sources to contamination and determine what protective measures are needed.
Date of assessment
Location/assessment
Vulnerabilities assessed
IRWD Baker Water Treatment Plant water assessment Santiago Reservoir (Irvine Lake) Sanitary Survey See MWD Imported Water Assessment below for water received from MWD IRWD groundwater assessment Lake Forest service area of IRWD
Septic systems and wildfires
2019
Dry cleaners and sewer collection systems Gas stations, historic gas stations, metal plating/ finishing/fabrication facilities, military installations, and plastics/synthetics producers Sewer collection systems, automobiles (gas stations), historic gas stations, and underground storage tanks (confirmed leaking tanks)
December 2022
Dyer Road Well Field
July 2023
Wells 21–22 Desalter
May 2009
Irvine Desalter Project
Crop irrigation and fertilizers Sewer collection systems Historical mining operations
March 2006 March 2003 January 2003
Orange Park Acres service area of IRWD Santiago Canyon service area of IRWD MWD Imported Water Assessment Colorado River Watershed Sanitary Survey
Recreation, urban/stormwater runoff, increasing urbanization in the watershed, and wastewater Urban/stormwater runoff, wildlife, agriculture, recreation, and wastewater
2020
Northern California’s State Water Project Watershed Sanitary Survey
2021
You can request copies of the IRWD reports listed by writing to IRWD, Attn: District Secretary, 15600 Sand Canyon Ave., Irvine, CA 92618. To request copies of MWD reports, call MWD at 800-225-5693 .
At-home water testing At-home test kits provide generic, approximate detections of substances in water but do not offer the analytical chemistry testing levels necessary to determine the quality of the water sample. These test kits are not based on standardized methods and do not have any way to verify accuracy. Customers who have their home’s water tested should contact a certified laboratory to ensure accurate results. Find a list at IRWD.com/laboratories . IRWD does not endorse specific laboratories for home testing. The data presented in this report is analyzed and reported by California Environmental Laboratory Accreditation Program certified laboratories that follow extensive quality assurance and quality control programs and are managed by qualified, trained scientists. Water providers take on the responsibility of verifying water quality data, and that process is heavily regulated by state and federal agencies.
The data in this report draws from 270,000 analytics performed using one of the best equipped, state- certified water laboratories in Southern California. Call IRWD at 949-453-5300 for any questions.
IRWD Water Quality Report 2025 | Page 9
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