top” of Source Source Evaluate risks to “Desk risks, or quality data protection area source water quality S2.2.2 confirmed not identified by: Information Available contamination of determining the about activities Determinands water quality aquifer or surface source protection or sites in the of health data not water. To do this area source significance properly the following protection area detected in the identifying key assessed. have to be done: that may lead to source water at contaminants identification contamination more than 50% known to be in of source of the source of the MAV. the water protection water. listing Contaminant area contaminants or sources in the production of activities in the source list of area that could protection area significant affect water are considered contaminants quality. to be detected in significant. Reconsider the source water chosen source. production of a an inventory of possible contaminants in the protection area. See Guide S1.1 S2.2.3 For Well not Reconsider source groundwaters, constructed in abstraction location. Inappropriate location in high accordance location and ground, away (or with Guide P1.3. construction up-gradient) from of abstraction Abstraction known sources of system point not pollution. Water is constructed in abstracted from accordance below the water with Guides P1.1 table. See Guide and P1.2. P1.3 For surface waters, location is away from stagnant areas, and storage is considered to dampen the effects of weather extremes. See Guides P1.1, P1.2 Notes: 1 The risk presented by this event can be changed by the treatment options chosen. The risk may be – low if the proposed treatment is satisfactory. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed POOR, CHANGEABLE OR DETERIORATING WATER QUALITY cont’d S2.2.4 Investigate future Obtain and analyse a developments copy of the local Future listed in local authority plan. development authority plan. and land use Alter or protect changes that location of source may abstraction point, compromise as appropriate. water quality.
S2.2.2 Available water quality data not properly assessed. “Desk top” of risks, or confirmed contamination of aquifer or surface water. To do this the following have to be done: identification of source protection area production of list of contaminants detected in source water production of a an inventory of possible contaminants in the protection area. See Guide S1.1 Source quality data Information about activities or sites in the source protection area that may lead to contamination of the source water. Source protection area not identified Determinands of health significance detected in the source water at more than 50% of the MAV. Contaminant sources in the source protection area are considered to be significant. Evaluate risks to source water quality by: determining the source protection area identifying key contaminants known to be in the water listing contaminants or activities in the area that could affect water quality. Reconsider the chosen source. S2.2.3 Inappropriate location and construction of abstraction system For groundwaters, location in high ground, away (or up-gradient) from known sources of pollution. Water is abstracted from below the water table. See Guide P1.3 For surface waters, location is away from stagnant areas, and storage is considered to dampen the effects of weather extremes. See Guides P1.1, P1.2 Well not constructed in accordance with Guide P1.3. Abstraction point not constructed in accordance with Guides P1.1 and P1.2. Reconsider source abstraction location. Notes: 1 – The risk presented by this event can be changed by the treatment options chosen. The risk may be low if the proposed treatment is satisfactory. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed POOR, CHANGEABLE OR DETERIORATING WATER QUALITY cont’d S2.2.4 Future development and land use changes that may compromise water quality. Investigate future developments listed in local authority plan. Alter or protect location of source abstraction point, as appropriate. significant Obtain and analyse a copy of the local authority plan.