Short answer
Oak Park gets its water from Village of Oak Park Public Works, Water & Sewer Division, measured at 142 mg/L (hard on the USGS scale), as reported by the city's water supplier. Hard water speeds up sediment buildup in a tank, so flushing and anode checks matter more here.
Oak Park at a glance
| Water utility | Village of Oak Park Public Works, Water & Sewer Division Source |
|---|---|
| Water hardness | 142 mg/L (hard on the USGS scale), as reported by the city's water supplier Source |
| Water heater permit | Yes: 2026 fee ordinance lists plumbing system installation (new or replacement), 'includes . water heater', as a permitted item. Contractors must be registered and have a valid certificate of insurance on file; $200 fine for allowing work by an unregistered contractor Source |
| Gas utility | Nicor Gas Source |
| Utility rebates | Nicor Gas residential energy efficiency rebates 2026: Tankless (UEF >= .95) $225; tanked storage (UEF >= .86) $150. Rules: installed 1/1/2026-12/31/2026 by a professional contractor; apply within 90 days of install or by 1/31/2027 Source |
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Water Heater Facts is an independent information service run by Strive LeadGen LLC. Local facts come from city, county and utility sources linked above; rules change, so confirm with the city before you start. Ratings and review counts change daily and are shown as of the date checked.