Full sub-catchment nutrient reports from the priority sub-catchments are produced every five years. These include trends in total nitrogen (TN) and total phosphorus (TP) concentrations, which are used as a basis for comparison to determine if the nutrient management actions put in place by the Parks and Wildlife Service are having a positive impact. Updates to nutrient summary information are provided as available. 

Sub-catchmentFull report (2016)Update (2017)
Avon River pdfAvon River catchment nutrient report 2016 4.15 MB pdfAvon River catchment nutrient report 2017 update 553.22 KB
Bannister Creek pdfBannister Creek catchment nutrient report 2016 4.97 MB pdfBannister Creek Catchment nutrient report 2017 update 1.03 MB
Bayswater Main Drain pdfBayswater Main Drain catchment nutrient report 2016 4.80 MB pdfBayswater Main Drain Catchment nutrient report 2017 update 932.75 KB 
Bennett Brook pdfBennett Brook catchment nutrient report 2016 6.64 MB pdfBennett Brook catchment nutrient report 2017 update 2.83 MB
 Bickley Brook pdfBickley Brook catchment nutrient report 2016 4.55 MB     pdfBickley Brook catchment nutrient report 2017 update 944.90 KB
 Blackadder Creek pdfBlackadder Creek catchment nutrient report 2016 7.78 MB   pdfBlackadder Creek catchment nutrient report 2017 update 1.52 MB
 Bull Creek pdfBull Creek catchment nutrient report 2016 3.20 MB pdfBull Creek catchment nutrient report 2017 update 1.08 MB
 Claisebrook pdfClaisebrook catchment nutrient report 2016 5.05 MB pdfClaisebrook catchment nutrient report 2017 update 1.20 MB
 Ellen Brook pdfEllen Brook catchment nutrient report 2016 3.65 MB pdfEllen Brook catchment nutrient report 2017 update 1.00 MB
 Ellis Brook pdfEllis Brook catchment nutrient report 2016 6.12 MB pdfEllis Brook catchment nutrient report 2017 update 1.09 MB
 Helena River pdfHelena River catchment nutrient report 2016 4.61 MB pdfHelena River catchment nutrient report 2017 update 837 KB
 Helm Street pdfHelm Street catchment nutrient report 2016 7.22 MB pdfHelm Street catchment nutrient report 2017 update 1.23 MB
 Henley Brook pdfHenley Brook catchment nutrient report 2016 621.75 KB pdfHenley Brook catchment nutrient report 2017 update 621.75 KB
 Jane Brook pdfJane Brook catchment nutrient report 2016 8.33 MB pdfJane Brook catchment nutrient report 2017 update 1.23 MB
 Lower Canning pdfLower Canning catchment nutrient report 2016 5.00 MB pdfLower Canning catchment nutrient report 2017 update 1.01 MB
 Maylands pdfMaylands catchment nutrient report 2016 4.79 MB pdfMaylands catchment nutrient report 2017 update 565.33 KB
 Mills Street pdfMills Street Main Drain catchment nutrient report 2016 4.92 MB pdfMills Street Main Drain catchment nutrient report 2017 update 949.85 KB
 Perth Airport North   pdfPerth Airport North catchment nutrient report 2016 6.36 MB pdfPerth Airport North catchment nutrient report 2017 update 937.24 KB
 Perth Airport South pdfPerth Airport South catchment nutrient report 2016 7.32 MB pdfPerth Airport South catchment nutrient report 2017 update 1.16 MB
 South Belmont pdfSouth Belmont Main Drain catchment nutrient report 2016 6.3 MB pdfSouth Belmont Main Drain catchment nutrient report 2017 update 1.10 MB
 South Perth pdfSouth Perth catchment nutrient report 2016 4.15 MB pdfSouth Perth catchment nutrient report 2017 update 1.58 MB
 Southern River pdfSouthern River catchment nutrient report 2016 3.7 MB pdfSouthern River catchment nutrient report 2017 update 1.02 MB
 St Leonards Creek pdfSt Leonards Creek catchment nutrient report 2016 5.37 MB pdfSt Leonards Creek catchment nutrient report 2017 update 851.31 KB
 Susannah Brook pdfSusannah Brook catchment nutrient report 2016 6.22 MB pdfSusannah Brook catchment nutrient report 2017 update 1.39 MB
 Upper Canning River   pdfUpper Canning River catchment nutrient report 2016 5.2 MB   pdfUpper Canning River catchment nutrient report 2017 update 1.16 MB
 Upper Swan   pdfUpper Swan catchment nutrient report 2016 4.22 MB   pdfUpper Swan catchment nutrient report 2017 update 969.42 KB
 Yule Brook   pdfYule Brook catchment nutrient report 2016 7.6 MB   pdfYule Brook catchment nutrient report 2017 update 2.38 MB