Attorneys for three environmental groups are urging Iowa officials to adopt tougher water quality standards. The federal Clean Water Act requires states to hold a public hearing about water quality regulations every three years and the Iowa Department of Natural Resources hosted one Thursday morning. Iowa Environmental Council legal counsel Mike Schmidt says a decade ago federal officials recommended that states monitor water for 94 toxins that could impact human health and it’s shocking Iowa standards still call for monitoring just 50. Dani Replogle is a staff attorney for Food and Water Watch, a national group that has about 24-thousand Iowa members. The DNR’s water quality resource coordinator says when the Iowa Nutrient Reduction Strategy was adopted in 2013, officials projected it would take many, many years to make progress given the scale of changes required in farming practices and upgrades needed in municipal wastewater plants.