City Can't Figure Out Why It Smells Like Cat Pee Readings show no health risk in New Castle, Penn. By Arden Dier, Newser Staff Posted Nov 28, 2014 8:10 AM CST 15 comments Comments Officials can't find the source of a cat pee smell in New Castle, Penn. (AP Photo/Animal Planet) (Newser) – You may think your town figuratively stinks; for residents of New Castle, Penn., the sentiment is literal. Environmental Protection agents in the city can't seem to figure out why there's a lingering odor of ... cat pee. Residents first noticed the smell Nov. 1 and it still hangs around the local sewage treatment plant. Officials took air and wastewater samples weeks ago, but it could be weeks before the final results arrive, the New Castle News reports. A rep says readings for oxygen, hydrogen sulfide, carbon monoxide, volatile organic compounds, and a lower explosive limit all appear normal, indicating there is no risk to health and safety.