# The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015, Part 1: Shellfish Waters Standards


Table 1
Shellfish Water Mandatory Standards
Parameter
Units
Standard
Temperature
◦C
A discharge affecting shellfish waters must not cause the temperature of the water to exceed by more than 2◦C the temperature of the waters not so affected.
pH
pH values will not reach levels outside of the range established so as to ensure the functioning of the ecosystem and the achievement of the values specified for the biological quality elements under Good Ecological Status
Silver
Annual mean (AA-EQS) (µg/l)
0.5
Maximum allowable concentration (MAC-EQS) (µg/l)
1
Salinity
Practical Salinity Units (PSU)
≤
A discharge affecting shellfish waters must not cause their salinity to exceed by more than 10% the salinity of waters not so affected.
Table 2
Shellfish Water Salinity Guideline Standard
Parameter
Units
Standard
Salinity
PSU
12-38

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Source: https://www.legislation.gov.uk/nisr/2015/351/schedule/5/part/1 (the official version)
Page: https://openlegislation.uk/water-framework-directive-classification-priority-substances-and-shellfish-waters-regulations-northern-ireland-2015/schedule-5/part-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.