Here is the latest Iowa news from the Associated Press…

DES MOINES, Iowa (AP) — Officials are investigating a wastewater discharge into an unnamed tributary of the Raccoon River in central Iowa. The state Department of Natural Resources says the discharge was verified Thursday following a report the day before. It’s unknown how long the discharge has been going on. DNR officials say the discharge is less than two miles from where the stream enters the Raccoon River. That’s also close to Des Moines Water Works. The property owners have been instructed to hire a contractor to the stop the discharge, which DNR officials estimate is between 5 to 10 gallons per minute.

WATERLOO, Iowa (AP) — A judge has dismissed exploitation charges against a former Waterloo teacher accused of engaging in inappropriate behavior with students. The Waterloo-Cedar Falls Courier reports a short trial this week for 56-year-old Larry Twigg concluded Thursday after Judge James Coil ruled that the alleged actions did not amount to a criminal offense. He dismissed one charge Wednesday and another Thursday. The charges were in connection with Twigg’s conduct with a student in 2009.

COUNCIL BLUFFS, Iowa (AP) — Authorities say a Council Bluffs man set his house on fire while his mother and 12-year-old brother were inside. The Council Bluffs Police Department says 21-year-old Jacob Rolfe is in custody following the early Thursday fire. The woman and child escaped the house uninjured. Rolfe is being held at the Pottawattamie County Jail. He faces two counts of attempted murder and a count of arson.

DES MOINES, Iowa (AP) — A Des Moines man has been accused of breaking his 3-month-old son’s arm. Des Moines police say 26-year-old David Ronald Vargason was arrested after the incident Wednesday. The infant was taken to a local hospital for treatment. Vargason told police he grabbed the boy’s arm with too much force and heard the arm break. Vargason has been charged with child endangerment causing serious bodily injury. He remains at the Polk County Jail.