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Entry point for information on chemcials in water.

General information regarding notification levels, or health-based advisory levels, for chemicals in drinking water.  A summary table of values is provided.

Includes links to PHG documents, reports on the PHG risk assessment process, and PHG exceedance reports.

OEHHA reviewed stormwater monitoring data for the purpose of characterizing used oil pollution in stormwater runoff. Stormwater runoff refers to water transported through stormwater conveyance systems during and after storm events.