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The Central Iowa Water Works lawn watering ban is now in its 16th day — except in Grimes.The northwest metro city is part of Central Iowa Water Works, the regional water authority that officially formed a year ago.CIWW announced the ban June 12 in an effort to keep up with customer demand and high levels of nitrates in water sources, the Des Moines and Raccoon rivers.Grimes is not enforcing the watering ban because it gets its drinking water from ground sources — not the rivers. Also, the city's water infrastructure isn't connected to the entire Central Iowa Water Works network.Plans are being considered for a 3.2 million-gallon-a-day treatment plant in Grimes to be part of CIWW.The watering ban did come up at the water works board of trustees meeting on Wednesday."I think the facts out in Grimes are purely different than is being experienced at Des Moines plants," said Jake Anderson, Grimes' city manager, at the meeting. "We would respectfully request the board's consideration to grant relief in the parts of Central Iowa Water Works systems where there are not issues."The matter was referred to the CIWW board of trustees' executive committee. The lawn watering ban for 600,000 businesses and residents of CIWW is still in effect.WATCH: Polk County supervisor speaks on new water quality report and its findingsRecent coverage of central Iowa water issuesCentral Iowa officials ban lawn watering to avoid potential 'water crisis'What are nitrates in drinking water and why Iowa officials are watching closelyLIST: Which Iowans are included in the ban on lawn watering?Des Moines shuts down spraygrounds as central Iowa cities work to conserve waterClive residents respond to lawn watering ban amid high nitrate levelsCentral Iowa landscaping businesses adapt to lawn watering banLawn watering ban still in place for more than 600,000 central Iowans; water usage drops by 30%Des Moines Water Works CEO links nitrate issue to farm fertilizersCommunities can reopen splash pads and spraygrounds, Central Iowa Water Works saysGet the Facts: How much water do West Des Moines data centers actually use?Splash pads turn back on one week later after new guidance from CIWWCentral Iowa water officials squash rumors that drinking water is unsafeCentral Iowa water quality experts say at-home nitrate test kits are unreliableMore Iowans considering at-home water treatment systems amid water quality concerns����vlog Investigates: Water demand shot up day before lawn watering ban began, data showsThis week's rain doesn't help high nitrate levels and the watering ban. Here's why.Answers to frequently asked questions about Iowa water quality, nitrates, testing and moreInside Central Iowa Water Works' testing laboratoryStudy of births in Iowa finds potential prenatal risk linked to nitrates in drinking waterSource water nitrate levels still elevated, but are improving, Central Iowa Water Works saysPolk County supervisor speaks on new water quality report and its findingsWATER: Study of births in Iowa finds potential prenatal risk linked to nitrates in drinking water