Environmental Targets And Priorities Overview: "As Is" Drinking Water Quality Situation
Ohio surface and ground water resources supply both public and private
drinking water systems. The 1996 amendments to the Safe Drinking Water Act established the
Source Water Assessment and Protection (SWAP) Program
to address both surface and ground water sources of public drinking water. Private water systems (such as individual residential wells) also need protection from NPS impacts. Consequently, the NPS Plan 2005-2010 places greater emphasis on existing NPS impacts to drinking water quality and planning to eliminate future threats and problems.
Potential drinking water contamination is of particular concern in shallow
sand and gravel aquifers, areas of karst limestone, and near surface fractured
bedrock aquifers with thin to absent soils. For example, the 2004 drinking water
contamination incident at South Bass Island (located in a sensitive fractured
limestone aquifer) has been linked to improper wastewater management and
The following resources are currently available to characterize the "as is" situation for Ohio drinking water quality.
2006, the Ohio EPA Integrated Water Quality Monitoring and Assessment Report
will include data about surface drinking water source impairment.
- Map of Surface Drinking Water Source Protection Areas;
- Map showing priority areas where surface drinking water sources are impacted or threatened by nitrates and/or pesticides;
- Case study about controlling NPS sources of pesticide contamination to a surface drinking water supply.
- Ground Water Quality;
- Map of priority ground water Drinking Water Source Protection Areas (public water systems with a high
susceptibility to contamination and associated adverse water quality impacts);
- Map showing ground water sources of drinking water that are impacted or threatened by nitrates;
- Map showing sensitive aquifers that are vulnerable to NPS contamination (critical to protect for both public and private water supplies);
- Case study about controlling sources of nitrate contamination to a ground water source of drinking water.