Glossary · Environmental
What are SNC and HPV flags in EPA ECHO?
In EPA's ECHO system, SNC (Significant Non-Compliance) and HPV (High Priority Violation) are flags marking a facility's most serious violations under environmental statutes such as the Clean Water Act, Clean Air Act and RCRA.
EPA's ECHO (Enforcement and Compliance History Online) publishes facility compliance status across environmental programs. An SNC flag (used for water and RCRA) or HPV flag (used for air) indicates a facility is in serious violation — the highest tier short of formal enforcement.
These flags, with penalties and a link to the official facility report, identify facilities with a documented environmental-compliance obligation — the moment an environmental consultant or treatment vendor can engage before a consent decree defines the scope.
Source: US Environmental Protection Agency (ECHO).
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What is the difference between SNC and HPV?
SNC (Significant Non-Compliance) is used for Clean Water Act and RCRA programs; HPV (High Priority Violation) is the equivalent tier for Clean Air Act programs. Both mark a facility's most serious violations.
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