Section 78170.

Cal. Health and Safety Code - HSC § 78170.
in effect
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“Tier” means a grouping of hazardous substance release sites that require removal and remedial actions, that are listed alphabetically, and that are of a roughly equivalent priority for removal and remedial action.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026

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