@Builder,
Water purity problems are local, not federal. That some local government officials fail in their responsibilities is a local problem that needs to be handled locally.
Our city, Sunnyvale, measures biological and metallic content of our water regularly, and publishes it on their site.
Our water quality meets all standards. Even with the draught, our county saved over 27% water, but water shortage is still a problem. The San Joaquin Valley farms uses most of the water to grow our fruits and vegetables, and that feeds more than just Californians.
That's the reason why most of us are aware of the snow packs in the Sierra Nevada Mountains where we get some of our water. We also have reservoirs, but they're about 40% of capacity.
Many in our county have brown lawns like ours. That's going to be our normal for many years to come. Some have even installed imitation grass, but that's not for me. I'll keep our brown lawn.