Municipal Stormwater Discharge Criteria -
Metro Vancouver & Fraser Valley
Last Updated: March 2, 2023
City of Abbotsford
Turbidity: < 25 NTU during normal weather conditions (< 25 mm of rain in the 24 hours prior), or < 100 NTU during significant rainfall events (≥ 25 mm of rain in the 24 hours prior).
Township of Langley
Turbidity: < 25 NTU, or < 100 NTU, within 24 hours of a Significant Rainfall Event, or as indicated by current Fisheries and Oceans standards
Erosion & Sediment Control Bylaw No. 4381 - 2006
City of Maple Ridge
pH: 6.0 - 9.0
TSS: < 25 mg/L during dry weather operation and < 75 mg/L during the "wet season"
Turbidity: < 20 NTU
A bylaw to protect watercourses in Maple Ridge Bylaw No. 6410 - 2006
City of North Vancouver
pH: 6.5 - 8.0
Turbidity: < 25 NTU, or < 100 NTU, during and for 24 hours following a Significant Rainfall Event (>25 mm in 24 hours)
Temperature: < 2 °C increase.
City of West Vancouver
pH: pH of receiving waters cannot be affected by more than 3.0 units above or below background
TSS: < 25 mg/L above background during May - September or < 75 mg/L above background during October - April
Watercourse Protection Bylaw No. 4364 - 2005
B.C. Ministry of Environment Water Quality Standards: Approved BCWQGs