The Orange County Sanitation District in Huntington Beach, California provides wastewater collection, treatment, and disposal services for approximately 2.6 million people. They had a combination of loud industrial equipment, cavernous space, and highly reflective surfaces creating an acoustic nightmare.

The Albuquerque Bernalillo County Water Utility Authority in Albuquerque, New Mexico operates a 76-million gallons per day (rated capacity) wastewater treatment plant that treats a daily average of five million gallons of sewage from New Mexico’s largest city and its surroundings.

In most countries, hearing protectors are required by law to be tested and labeled in a specific way. The idea is that by using a standardized measurement method and a straightforward, one-number rating, it should help users decide which hearing protector to choose. However, it turns that one number often doesn’t tell the whole story.

We all know that the requirements for OSHA workplace noise measurements involve establishing the individual noise exposure for our workers to be sure that we are protecting them from excessively high noise levels.