Bridge Washing and Cleaning

The Washington State DOT (WSDOT) has negotiated with its Department of Ecology, a permit which allows the DOT to wash four over-water bridges in a trial to determine the appropriate conditions under which future bridge washing should be permitted.

Download the WSDOT’s NPDES Bridge Permit.

The Maine DOT has also developed a Best Practices agreement with its Department of Environmental Protection for the cleaning and washing of bridges.  The agreement may be viewed at


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