Natural England are exploring the use of replacing inefficient septic tanks and package treatment plants (PTPs) with PTPs that have a higher treatment efficiency for phosphorus and nitrogen to improve water quality in up to 27 catchments. The anticipated catchments are detailed in a table in the Annex.
For each catchment, we require estimates of the following:  
Scale of opportunity: The scale of opportunity (in units) of upgrading inefficient septic tanks…

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