Compliant hearing protection in a stockroom follows a set sequence: measure noise, notify affected staff, apply controls, fit protection, train, test hearing, and keep records. The takeaways below follow that sequence, and each section after them gives the detail.
Key takeaways
- Measure noise exposure whenever reasonable information suggests it could reach or exceed 85 dBA TWA8.
- Under Washington's rule, tell each employee at or above the action level of their monitoring results within five working days of receiving them.
- Apply feasible administrative and engineering controls first, before relying on personal protective equipment.
- Fit, log, and maintain personal protective equipment as the last layer against whatever controls cannot close, then train affected staff and set up audiometric testing once exposure crosses the action level.
- Keep a records file covering monitoring reports, notifications, controls and equipment logs, and training and audiometric records.
A stockroom runs louder than most people expect. Pallet jacks rattle on concrete, forklift horns sound across aisles, balers and compactors cycle all shift, and conveyor motors hum without a break. Staff stand in that noise for hours. Their hearing changes slowly, and by the time someone complains, the damage is done.
Noise rules exist to catch this early. They ask you to measure, warn, protect, and check that the protection works. The sections below cover each part of that sequence and cite the source where one is given, so you can show an inspector why you did what you did.
Why noise compliance starts with measurement
You cannot protect staff from a hazard you have not sized. Measurement tells you who is exposed, how badly, and where in the building the trouble sits.
Washington's rule puts it directly: you must run employee noise exposure monitoring whenever reasonable information suggests any employee's exposure could reach or exceed 85 dBA TWA8, the eight-hour time-weighted average. That trigger is easier to hit than you might think. A baler cycling near a picking station, a horn sounding repeatedly at a dock door, or an open compactor room next to packing benches can all push a role over that line on their own.
Monitoring does not need to be fancy. What matters is that you can name the role, the location, and the measured level.
If you are in a Canadian operation under CCOHS guidance, the same idea applies: the 85 dBA Lex criterion level is the common threshold that triggers hearing protection, training, and audiometric testing. Canadian federal regulations use 87 dBA instead, so confirm which standard your site follows before you pick a number to work from. See the full explanation in the Canadian Centre for Occupational Health and Safety guide on occupational exposure limits.
Read the two measurement rules that trip people up
Two measurement details catch managers off guard. Both come from California's noise exposure limits.
First, what counts as continuous. California says if noise maxima happen at intervals of one second or less, treat the noise as continuous. A line of rapid impacts is not a series of separate events you can ignore. One second is a long time when a machine is hammering. See the rule in Section 5096 of the California Code of Regulations.
Second, what counts as protection. California requires protection once sound levels exceed the table of limits, measured on the A-scale at slow response. That A-scale, slow-response setting is what your meter should be set to for these checks.
Two other measurement notes matter. California also sets a hard ceiling for impulsive or impact noise: exposure should not exceed 140 dB peak sound pressure level.
Exchange rates explain why two sites can give you different limits for the same work. CCOHS describes two in use: the 3 dBA rule and the 5 dBA rule, with criterion levels of 85 dBA and 90 dBA producing two different sets of exposure guidelines. The 3 dBA rule is stricter. For example, under the 3 dBA exchange rate, the maximum permitted duration for a 100 dBA exposure is 15 minutes.
Here is how the Washington and California rules sit side by side:
| Item | Washington | California |
|---|---|---|
| Action / protection trigger | 85 dBA TWA8 | Exceeds Table N-1 (A-scale, slow) |
| Peak / impulse limit | 140 dBC (fast response) | 140 dB peak |
Warn every affected employee within five working days
Measurement results are useless if they sit in a folder. Washington requires you to notify each employee whose exposure equals or exceeds 85 dBA TWA8 of the monitoring results within five working days of when you receive them.
That clock starts when you receive the results, not when you get around to reading them. Build the five days into your project plan. Have the notification draft ready before the monitoring visit, so the day results land, the letters go out.
Each notice should say what was measured, the number that came back, and what changes are coming. Hand the notice over in person where you can, then keep a signed copy. If the employee works a shift you rarely overlap with, send it and follow up with a note confirming they got it.
The five-day window applies to employees at or above the action level. It is not optional, and it is not tied to whether you have finished fitting protection yet. Tell them the result first, then explain the plan.
Let staff observe the measurements
Washington gives exposed employees and their representatives the right to observe any noise exposure measurements you conduct.
Observation builds trust and improves the data. The employee who knows their own station will stand where they actually work. They will point out the corner where the horn is loudest and the bench where the compactor sits closest. That is exactly the detail a quick walk-through misses.
Plan for it. Tell affected staff and their rep when monitoring is scheduled. Bring enough meters or dosimeters so an observer can see readings live. Walk them through what the numbers mean before the shift, not after.
Observation also settles arguments. If a staff member disputes a reading later, an observed measurement with a witness attached is much harder to challenge than a report they never saw.
Run administrative and engineering controls first
California's order of operations is clear: when employees are exposed to sound levels above the table, feasible administrative or engineering controls must be used.
Administrative controls change the work, not the machine. Rotate staff out of the loudest zone. Move the packing bench a few metres from the baler. Shift noisy tasks to a time when fewer people are nearby. Schedule the compactor run when the picking team is on break. For the forklift side of the floor, see forklift rules for warehouse compliance.
Engineering controls change the machine or the room. Put a sound-dampening cover on the compactor. Line the walls of the compressor room. Replace a rattle-prone pallet jack. Keep doors between the dock and the office floor closed.
Feasible is the key word. How feasibility is judged depends on your jurisdiction's wording, so check your assessment with the inspector or local authority. Document what you assessed and why you chose or skipped each option. That file protects you if someone later asks why staff were still exposed.
WorkSafeBC makes the same point from the other direction: controls and protection, used together, can limit the risk of noise exposure. Controls first, protection as the layer that catches whatever is left.
Fit personal protective equipment as the last line
If administrative and engineering controls do not bring levels down inside the limits, California requires personal protective equipment to be provided and used to close the remaining gap.
Earplugs and earmuffs are the last layer, not the first. Over-relying on them is a common mistake. Staff stop noticing the hazard because their ears feel protected, so nothing ever gets fixed at the source.
Fit matters more than the rating printed on the box. Loose plugs do not seal. Small earmuffs over large headbands slip. Ask your supplier for fit-test training or a fit-check routine, and repeat it whenever you change brands.
Log what each person was issued, the date, and the size or style. Replace worn or contaminated equipment on a schedule rather than waiting for someone to ask. A plug pulled from a pocket and reinserted with dusty hands is not protection.
Record-keeping ties back to the monitoring rule. You already have the exposure numbers and the notification date. The equipment log closes the loop, showing what you did about each result.
Train staff on the numbers that apply to them
CCOHS notes that over an exposure limit of 85 dBA Lex or an "at any time" sound level limit of 90 dBA, employers must provide hearing protection, train workers, and implement audiometric testing. That trio is the common package across Canadian jurisdictions.
Training should be short, specific, and tied to the measurements you took. Show the affected staff their own reading. Show them the limit that applies. Explain exchange rates in one sentence: every 3 or 5 dBA (depending on the rule) cuts the allowed time in half.
Ontario's rule illustrates the shape of a typical limit: no worker exposed to a sound level greater than a time-weighted average of 85 dBA over an eight-hour day. Use the wording that matches your jurisdiction when you write your own brief.
Cover insertion, seal checks, removal, and storage. Cover why plugs cannot sit loose in a pocket. Cover when to swap to earmuffs for a very loud, short task. Repeat training whenever the equipment, the process, or the job role changes.
Set up audiometric testing to catch change early
Hearing loss from noise builds quietly. Staff adapt to the loss, so they rarely notice it themselves. Audiometric testing is how you find it before someone does.
CCOHS includes audiometric testing in the standard package required once staff cross the action level. Schedule baseline tests when someone starts, then periodic retests on a set cycle. Compare each result to that person's own baseline rather than to a general standard.
An early shift in a threshold is your signal. It points to a leak in the program: a bad fit, a control that was not working, a task done without protection. Follow up in the field the same week, not at the next annual review.
Offer testing on paid time. If people have to book it themselves, attendance drops and the data gets thin. Keep results confidential and give each person their own copy.
Keep records an inspector will accept
Records are what turn good practice into provable compliance. Build a simple file with four parts.
- Monitoring reports: dates, locations, roles, instrument used, and the measured levels.
- Notifications: dated copy of each employee notice, with proof of delivery inside the five-working-day window.
- Controls and equipment log: what you changed, what you issued, sizes and dates.
- Training and audiometric records: attendance sheets, material covered, and test dates.
Keep the observation notes too. If staff attended a measurement, note who came and what they flagged. That shows an inspector your process was open, not one you ran behind closed doors.
Store everything where you can pull it fast. Paper in a labelled binder or a controlled digital folder both work, as long as retrieval does not depend on one person being on shift. For the injury side of your paperwork, see shop injury logs.
Review the file whenever the floor changes. New machinery, a re-laid-out aisle, a change of supplier on the baler — any of these can shift the numbers and restart the monitoring cycle.
Illustrative example: a stockroom crossing the action level
A stockroom with eight staff ran a monitoring round after complaints about the baler. Two roles came back at or above 85 dBA TWA8. Results arrived on a Tuesday.
The manager drafted notices the same day. Each affected staff member got their number and an explanation within five working days, with a signed copy on file. The rep and one picker joined the follow-up observation run, standing at the baler while a second reading confirmed the level.
The baler moved one bay away from the packing bench. Compactor runs shifted to the end of the picking block.
For the remaining gap at the baler station, staff received earmuffs sized to fit, logged with dates. A ten-minute briefing covered the reading, the limit, and the fit check. Audiometric baselines were booked for all eight staff during the same paid shift.
When to ask someone else
Choosing a specific meter model, dosimeter or supplier is a question for your jurisdiction. Ask your provincial or state occupational health authority, or a certified industrial hygienist, before you purchase instruments. They will confirm the instrument class your jurisdiction accepts.
Ask the same parties when you change your floor layout or bring in new equipment. A quick re-check avoids a gap between the old report and the new reality.
Next step today: walk the stockroom and list every role near a baler, compactor, horn or conveyor. Those roles are where to start measuring.
FAQ
How often must you re-monitor after the first round? Re-monitor whenever reasonable information suggests exposure may have changed or could reach the action level. New equipment or a layout change is a good reason to re-check, and you should confirm with your local authority how it defines reasonable information.
What if one employee is over the limit but the rest of the team is fine? Under Washington's rule, the notification duty attaches to each employee at or above the action level, not to the group average. Notify that person within five working days, and fit and train them while the others continue as before.
Can you rely on plugs alone if the machine cannot be moved? Plugs can be the answer only after feasible controls fail to bring levels within the limits. California's order says controls first, then equipment for whatever remains. If a control is not feasible, document the assessment, then provide and require equipment that brings the exposed level inside the limits. Your record shows why.
Do visitors and temporary staff count? They are exposed people in your space. The safest approach is to measure their working area, issue protection, and brief them the same way you brief your own team. Confirm the exact wording your jurisdiction uses for non-employees with your local authority.
Where does a delivery driver waiting at the dock fall? Short exposure at a dock can still sit under the action level even when continuous noise at a nearby station does not. Measure the specific spot and duration. The notification duty covers employees, so a driver who is not your employee may fall under different rules. Confirm with your local authority what applies to non-employees.