Water Sampling

GSCA monitors surface water quality eight times a year at 35 sampling sites throughout the watershed. Each sample is collected following standardized protocols and sent to Ministry of the Environment laboratories for detailed chemical analysis. These analyses measure a range of water quality parameters, including E. coli, total phosphorus, and chlorides, which help us understand the condition of our rivers and streams. By tracking these indicators over time, GSCA can identify emerging trends, detect potential concerns, and support science‑based decisions that protect watershed health.

Stream Conditions

Since 2000, GSCA has documented stream during summer months when flows are stressed the most. This data is maintained in a georeferenced database and available to Municipal partners and other agencies upon request. The following conditions are monitored:

Stream crossings, baseflow descriptions and fish presence: At each stream crossing, staff record baseflow conditions such as “good,” “some,” “trickle,” or “dry.” The type of crossing, its cross‑sectional area, and whether fish are present is also documented.

Thermal stream classification: Staff use handheld thermometers and digital data loggers to record temperatures on days when the air temperature exceeds 24°C. These readings help identify whether a watercourse supports coldwater species such as brook trout, coolwater species such as rainbow trout, or warmwater species such as baitfish.