Oshawa sits at City Score rank #136 with a standing of 52%, from 7 of 8 open-data pillars (tax, construction, connectivity, indoor air, water, seismic hazard, growth, safety). Missing pillars score at median standing so thin coverage cannot inflate the rank. Dropping 84 places versus 2022 (#52 → #136).
Latest owned placements: building permit value rank #24 of 25 (2025); indoor radon rank #253 of 327 at 63 Bq/m³ survey mean; residential mill rate rank #20 of 57 (15.24 mill rate). Full tables and method notes live on each study edition; atlas readings for the same slug open from the topic buttons.
Against the national corpus, Oshawa carries a City Score standing of 52% (rank #136 of 343) with 7 of 8 pillars observed. That sits 0 points below the Ontario peer average across 123 ranked cities. Within Ontario, Oshawa ranks #66 of 123 on City Score.
The strongest signal in the current chart is population growth (standing 90%, rank #36 of 343, +2.8% annual growth). The weakest observed pillar is building permit value (standing 8%, rank #24 of 25).
Drinking-water hardness on the water atlas reads 125 mg/L as CaCO₃ for Oshawa. Compare that figure to the hardness pillar on the chart and to the national hardness guide on the hub.