The groundwater directive requires that where a groundwater body fails to meet its quality standards, the groundwater has to be remediated and restored to good chemical status. Where leaching occurs from disused mines into groundwater then remediation, where it is technically possible, will be required. Old, disused and perhaps illegal landfills which cause chemical contamination of groundwater will also have to be restored. There are potential cost burdens in those areas.
I am not aware of any significant discharge directly into groundwater by any industry. It is not normal to license an industry to discharge into groundwater. Aside from old and disused mines and contaminated landfills, the main threat to groundwater is diffuse pollution involving nitric contamination from agriculture. On the whole, the measures provided for under the nitrates directive which, as Mr. Sadlier said, is close to being signed into law by the Minister, will suffice in the context of agricultural activities.
Septic tanks, as a general rule, will not cause widespread contamination of a groundwater body. There will probably be more localised scenarios and problems. It has been mentioned that groundwater contamination by septic tanks would be addressed where properly sited and designed septic tanks are put in place by a competent person, where a proper site assessment has been done and where the septic tank and percolation area is constructed in accordance with the technical guidance provided by the EPA.
There is research to show that in combating bacteriological contamination from septic tanks, where there is a proper depth of soil or subsoil placed beneath the percolation area, proper permeability of the subsoil and sufficient depth to treat pollutants before they reach groundwater, the job will be done perfectly. In addition, local authorities have made great strides, with the support of the EPA and the Geological Survey of Ireland, in putting in place training courses for site assessors.
A number of local authorities are insisting that people involved in planning applications for septic tanks undertake a site assessment and training course. They require any site assessments undertaken for that purpose to be done by a trained assessor. This is all contributing to better decisions being made and the avoidance of problems that may have occurred in the past.
An earlier question raised the matter of current problems with septic tank placement and how we are to deal with these. As part of the work being done for the purpose of the water framework directive, we have identified a number of key issues where further work needs to be done.
That is one of the areas, and work has been initiated through the western river basin project. It will cover the whole country and is being funded by the Department of the Environment, Heritage and Local Government as part of the contribution towards implementation of the water framework directive, where an evaluation is being done and maps are being produced of clusters or concentrations of houses and one-off dwellings that would not be connected to sewer systems. That is being placed on maps in conjunction with areas where there is a likely risk to groundwater through lack of depth of subsoil, inappropriate quality of subsoil and the nature of underlying rock such as karst. There may also be types of groundwater features susceptible to pollution.
That will identify areas likely to be problematic, and where work may be required. For example, sewer connections may need to be put in to replace existing septic tanks or there may be other types of approaches. The details of what is required will not be fully worked out until the evaluation assessment is completed. That would probably be in 12 to 18 months time. This will be brought forward as the types of actions or programmes of measures required to be put in place and inserted in the river basin management plans. They would bring about groundwater quality improvements which need to be made.
The details of this will be identified in the river basin plan and be open for public consultation. It will be openly presented for consultation and input by those involved.