Years ago I Lived up in Washington state, they were trying to passed a law few years back regarding washing your vehicle in the driveway and I quote from the article reason why they wanted it:
Washing your car or boat in the driveway or street is a residential ritual as American as backyard barbecues. But the state of Washington is telling its local governments they must prohibit home car washing unless residents divert the wash water away from storm drains, where they say it causes water pollution.
"I understand this is something people have done for a long time," says Bill Moore, water quality specialist with the Washington state Department of Ecology, which is requiring the ban. "It's not something we should be doing any longer."
He says the soapy runoff is toxic to salmon and other fish and that small metal particles that wash off cars, such as brake dust, is harmful, too
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