It wasn't until he hand-delivered bottles of the discolored water to School Board members at a public meeting that the district took action.
That was five years ago, and Seattle Public Schools has addressed those problems and adopted tough water-quality standards since then. But Cooper warns of similar environmental health and safety problems in schools statewide – and that Washington's code is woefully outdated.
With the state Board of Health on the cusp of revising its rule governing environmental health and safety in schools – the first major changes in nearly four decades – it's time for the public to take note, Cooper said.
"If you don't pay attention, and don't get involved, it will be your own backyard, your own child being affected," he said.
The proposal under consideration would modernize the rule, adding standards for indoor air and water quality and playground safety.