The U. S. Environmental Protection Agency (EPA) has proposed a new approach for enforcement targeting under the Safe Drinking Water Act (SDWA) for Public Water Systems. The new approach is designed to identify public water systems with violations that rise to a level of significant noncompliance by focusing on those systems with health-based violations and those that show a history of violations across multiple rules. This system-based methodology is intended to ensure the consistency of the PWSS national enforcement program. The new approach includes a revised Enforcement Response Policy (ERP) and new Enforcement Targeting Tool (ETT).
This system-based approach uses a tool that enables the prioritization of public water systems by assigning each violation a "weight" or number of points based on the assigned threat to public health. Points for each violation at a water system are added together to provide a total score for that water system. Water systems whose scores exceed "11" are considered a priority system for enforcement.
The enforcement targeting formula is the basis for the enforcement targeting tool that identifies public water systems having the highest total noncompliance across all rules, within a designated period of time. A higher weight is placed on health-based violations (including Treatment Technique and Maximum Contaminant Level violations). The formula calculates a score for each water system based on open-ended violations and violations that have occurred over the past 5 years, but does not include violations that have returned to compliance or are on the "path to compliance" through a specified enforceable action.