Lincoln Square Water Hardness & Quality Report (2026)

Lincoln Square, Illinois, a neighborhood on the north side of Chicago in Cook County — a historically significant German-American Chicago neighborhood (the 'Germanic Quarter,' known for the Maypole and the German-American community institutions including the Goethe-Institut Chicago and the Schiller Monument), now a diverse and rapidly gentrifying north side Chicago neighborhood known for its artisan food shops, independent restaurants, live music scene (Old Town School of Folk Music), and a thriving Japanese-American and Korean-American community alongside its German heritage — draws its municipal water supply from Lake Michigan via the CDWM. Water hardness in Lincoln Square measures 142.5 mg/L — classified as moderately hard.

Lincoln Square's moderate hardness — among the softer Chicago neighborhood supplies — reflects the north side distribution infrastructure's more moderate mineral accumulation compared to the south side. The Chicago north side's Lincoln Square–Ravenswood area developed primarily in the 1890s–1920s as a German-American working-class and middle-class neighborhood, with distribution mains from this era accumulating moderate mineral content from the Lake Michigan source (~130–145 mg/L). The Lincoln Square distribution zone produces the moderate 142.5 mg/L.

At 142.5 mg/L, Lincoln Square residents encounter moderate-to-hard scale accumulation. Monthly cleaning with citric acid solution is recommended. CDWM consistently delivers water meeting all Illinois EPA and federal EPA Safe Drinking Water Act requirements.