St. John's drinking water path

Source

Windsor Lake Surface water · +4 sources

raw water

Intake

Raw water intake pump station

to plant

Treatment

Windsor Lake Water Treatment Facility chlorination · UV · filtration · +2 more plants

finished

Mains

Distribution Three surface-water plants feed city reservoirs (more than 95,000 m³ storage) and the distribution system. City does not fluoridate. Daily sampling from 70+ distribution locations.

drinking water

Tap

Household tap St. John's

Source & supply
Windsor Lake
Broad Cove River watershed
Little Powers Pond
Three surface-water plants feed city reservoirs (more than 95,000 m³ storage) and the distribution system. City does not fluoridate. Daily sampling from 70+ distribution locations.
Regional surface supplies stretch from Windsor Lake near the city to Bay Bulls Big Pond south of town — not a single harbour intake.
Treatment
Windsor Lake Water Treatment Facility
Treats Broad Cove River / Windsor Lake / Little Powers Pond watershed water; membrane microfiltration, UV, chlorine, lime/CO2 alkalinity adjustment; up to 70,000 m³/day.
Bay Bulls Big Pond Water Treatment Facility
Largest plant; conventional DAF process with UV and chloramine disinfection; up to 85,000 m³/day; also supplies regional partners (e.g. Mount Pearl / Conception Bay South area per provincial inventory).
Petty Harbour Long Pond Water Treatment Facility
At the tap
Hardness 146 mg/L (Hard)
Grade B (Good)
pH 6.8999999999999995 · lead 0.2 μg/L
ECCC / municipal open data (seed)