Editing Trinity Broads (section)

==Water quality==
The Environment Agency measure the water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of [[invertebrate]]s, [[angiosperm]]s and fish. Chemical status, which compares the concentrations of various chemicals against known safe concentrations, is rated good or fail. Muck Fleet is designated as "heavily modified", which means that the channels have been altered by human activity, and the criteria for this designation are defined by the [[Water Framework Directive]].<ref>{{cite web |url=http://environment.data.gov.uk/catchment-planning/help/glossary |website=Catchment Data Explorer |title=Glossary (see Biological quality element; Chemical status; and Ecological status) |publisher=Environment Agency |access-date=15 May 2017}}</ref>

The water quality for Muck Fleet, which includes most of the broads, was as follows in 2019.
{| class="wikitable"
|-
! Section !! Ecological Status !! Chemical Status !! Length !! Catchment !! Channel
|-
| {{waterqual_title |desc=Muck Fleetf |asset=GB105034050860 |accessdate=27 November 2021}} 
| {{Waterqual mod}}
| {{waterqual_fail}} 
| {{convert|7.0|mi}}
| {{convert|18.81|sqmi}}
| heavily modified
|}

Reasons for the water quality being less than good include groundwater and surface water abstraction, physical modification of the channel, and runoff from agricultural and rural land. Like most rivers in the UK, the chemical status changed from good to fail in 2019, due to the presence of polybrominated diphenyl ethers (PBDE) which had not previously been included in the assessment.<ref>{{cite web |url=https://environment.data.gov.uk/catchment-planning/help/usage#chemical-status |archive-url=https://web.archive.org/web/20240314040920/https://environment.data.gov.uk/catchment-planning/help/usage#chemical-status |archive-date=14 March 2024 |url-status=live |title=Chemical Status |publisher=Environment Agency |year=2023}}</ref>