Why don't we use less "clean" sources of water when drinking isn't a concern? I get that having just one infrastructure simplifies things but surely coastal cities can pipe in sea water for things like this?
Te Upoko o te Ika a Māui / Wellington
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Seawater is a maintenance nightmare, it's incredibly corrosive to almost any metal, so any pipework would need to be either plastic or concrete. It will also kill plants, so can't be used for watering lawns etc, so this would only be useful for firefighting purposes.
Ships will often use sea water for jobs like flushing toilets, but I can't imagine that being worthwhile running a second water main for.
I imagine the salinity would cause all sorts of issues, and as you say just having one source is better when things work as they should
Singapore have a separate grey water line that's not drinkable, it's still not salty though