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Posted on: July 20, 2023

Water Quality in City of Ridgefield

A glass full of clean water sitting on a table.

A complete summary of the quality of water provided by the City of Ridgefield is provided each year in the Water Quality Report. This report provides our latest water sampling results. The following substances are monitored: Trihalomethanes, Haloacetic Acids, Chlorine, Arsenic, Chromium, Fluoride, Nitrate-N, Iron, Manganese, Chloride, Sulfate, Calcium, Sodium, Lead and Copper. Ridgefield water quality continues to exceed state and federal standards.

Read the latest Water Quality Report (PDF)

Backflow Prevention

In addition to regular sampling, another way we deliver safe and reliable water is through the city’s Cross Connection Control Program.  Homeowners with an in-ground irrigation system are required to install a backflow prevention device (backflow assembly) to prevent water contaminants on their property from entering the City’s clean drinking water supply. These devices are required to be tested annually, per the Washington State Department of Health, under our backflow program.

Regulars testing ensures the backflow device is working properly to protect water supply. To assist with this, the city sends courtesy letters to homeowners and businesses when it’s time for their backflow assembly to be tested. Courtesy notices include a list of Approved Backflow Testers who’ve met the state and city requirements and are authorized to test in the City of Ridgefield. Our public works office staff works diligently with property owners and backflow testers to meet compliance. While city code allows disruption of water service for failure to comply, our efforts and desire is to minimize the need for this final and last resort. With the convenience of in-ground irrigation systems it becomes a shared responsibility to keep our drinking water safe for neighbors and community. 

For additional information about this annual requirement, please see our website for the Backflow and Cross Connection Control Program.


You may have seen recent articles about local area water providers testing and finding small amounts of PFAS, or per- and polyfluoroalkyl substances, in their drinking water supply. In the next few months, the City of Ridgefield will begin testing its water wells and reservoirs for the presence of PFAS and is currently developing a plan to respond if PFAS are found. Testing for PFAS is not required until September, 2024, but we want to be proactive and begin testing early. The city is committed to providing you safe and reliable drinking water and at this time, we believe the possibility of finding PFAS in our water system is low.