Ottawa County, Michigan: drinking water report. Ottawa County on Michigan's Lake Michigan shore has about 296,000 residents in communities including
Ottawa County on Michigan's Lake Michigan shore has about 296,000 residents in communities including Holland, Grand Haven, and Zeeland. Water sources are split – lakeside communities draw from Lake Michigan, while inland areas rely on groundwater. The county's mix of manufacturing (automotive parts, office furniture) and agriculture (blueberries, asparagus, dairy) creates distinct water quality profiles depending on location.
Lake Michigan water supplied to Grand Haven and other shoreline communities is generally high quality, drawing from deep intakes in the lake. Inland groundwater tells a different story. According to Michigan EGLE's 2024 groundwater monitoring, nitrate contamination from agricultural activity affects the shallow aquifer in the county's eastern and southern townships. A 2024 Ottawa County Health Department well survey found 15% of tested private wells exceeded the nitrate MCL of 10 mg/L.
The former Park Township Airport and industrial sites in Holland have documented PFAS concerns. Michigan EGLE's 2024 PFAS investigation found PFOS at 9 ppt in monitoring wells in the Holland area. The West Michigan Regional Airport in adjacent Muskegon County also contributes PFAS to the regional groundwater system.
Ottawa County residents on Lake Michigan supply benefit from a clean, well-treated source. If you are on a private well inland, nitrate from agricultural activity is the primary concern – particularly during spring when fertilizer application peaks.
Check your water for data at your address. For well owners, annual nitrate testing is essential. Reverse osmosis handles both nitrate and PFAS in one system. Our water filter guide covers options for Michigan groundwater. Pull your detailed report for local data, and visit our Michigan page for statewide patterns.