Hearing Conservation Program
A Hearing Conservation Program (HCP) is a formal employer-implemented system required when workplace noise exceeds regulated limits, designed to control noise exposure and prevent occupational hearing loss. In British Columbia, it must meet elements set out in WorkSafeBC OHSR Part 7, including noise measurement, education, engineered controls, hearing protection, posting of hazard areas, audiometric testing, and annual program review, aligned with CSA standards.
On a manufacturing or shop floor, the HCP translates into concrete activities: noise surveys using sound level meters and dosimeters to map hot spots and calculate Lex,8 per CSA Z107.56; implementing engineering controls like machine enclosures, acoustic barriers, and vibration isolation; providing hearing protection devices (HPDs) per CSA Z94.2 with fit-testing; posting warning signs at noise hazard areas; conducting baseline and annual audiograms; and delivering annual training. The program is documented and reviewed annually, with records retained for each worker's employment duration.
At what exposure level must I implement a Hearing Conservation Program in BC, and how does this relate to CSA Z1007 and CSA Z107.56?
WorkSafeBC requires a noise control and hearing conservation program when worker exposure exceeds either 85 dBA Lex,8 (8-hr equivalent) or 140 dBC peak. Under OHSR s.7.2, employers must assess noise exposure for workers who may exceed 82 dBA Lex,8, which is the assessment trigger. Noise exposure evaluation should follow CSA Z107.56, which prescribes how to measure and calculate Lex,8. CSA Z1007 provides the program management framework for a Hearing Loss Prevention Program once the regulatory trigger is met.
How is Lex,8 calculated in practice, and how does it drive control selection and HPD attenuation?
Lex,8 (daily noise exposure level normalized to 8 hours) is calculated per CSA Z107.56 from either time-weighted average sound level measurements or dosimetric data across tasks. WorkSafeBC guidance provides calculation methods and indicates that if Lex,8 exceeds 85 dBA, the exposure limit is exceeded and a hearing conservation program must be implemented. Once Lex,8 is known for each job/task, HPD selection (under CSA Z94.2) ensures that effective protected exposure (Lex,8 minus real-world HPD attenuation) is below 85 dBA, while avoiding excessive over-attenuation that can affect communication and safety.
What are the minimum required elements of a WorkSafeBC-compliant Hearing Conservation Program document for SafeDesk?
At minimum, the written program must include: noise measurement procedures (methods, instruments, calibration, sampling strategy, calculation of Lex,8); education and training program (frequency, content, audience); engineering and administrative noise controls (identification, evaluation, implementation plan); hearing protection program (selection criteria per CSA Z94.2, fit practices, storage, inspection, replacement policy); posting of noise-hazard areas (criteria for signage, sign locations, sign wording); audiometric testing program (provider qualifications, baseline and annual schedule, test protocols, interpretation and follow-up actions); recordkeeping (retention of noise surveys, training records, HPD records, audiograms for duration of employment); and annual review and continuous improvement (defined performance metrics, management review process, action tracking).