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The California DWR has this map:

locations of potential sources of per- and polyfluoroalkyl substances (PFAS) https://gispublic.waterboards.ca.gov/portal/apps/webappviewe...

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Does California specify which water mains are old asbestos cement pipes? That famously caused ecological disasters in the Bay Area 20+ years ago, but they didn't (in newspaper articles i saw) show the extent of such.

I'm not aware of that. I doubt asbestos cement water mains are a significant health risk to the end user. I think any asbestos that could become airborne is a risk. To the workers who installed those pipes, certainly.

Asbestos is implicated in gastrointestinal cancers too.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4856305/

Luckily we can use common sense and intuit that razor sharp microglass embedded in the colon will cause cancer via immune response.

Do you work for an asbestos company?

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