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Only a certified operation and maintenance (O&M) inspector should inspect your septic system. Find a list of certified companies at tpchd.org/septicservicecompanies.

O&M inspectors need to receive education and pass an exam to get certified. They need to attend additional training each year to stay certified. The Washington On-site Sewage Association (wossa.org) certifies and trains O&M inspectors. We remove uncertified inspectors and companies from our list and follow-up on complaints about inspectors.