The City of Marysville has been collecting ambient water quality monitoring data since around the year 2000. Snohomish County Surface Water Management had previously been collecting water quality data in this watershed since about 1992. Historical data from Snohomish County can be accessed via their Surface Water Online Data webpage. More recent water quality data collected by the City of Marysville is in response to the TMDL Requirements in the NPDES Phase II Permit. To see recent water quality data collected, please contact Surface Water Management.