QSD vs QSP: California's Two Different SWPPP Credentials

Search "swppp california" for five minutes and QSD and QSP turn up on the first page, often used as if they were interchangeable shorthand for "the stormwater person." They are not the same credential, and California's Construction General Permit does not treat them as the same job. One person designs and signs the plan. A different function implements it on site and carries out the inspections once work starts. This post covers the role split itself, not who is eligible to hold either credential, which is its own question with its own answer.

What the permit actually assigns to each role

The governing document is Order WQ 2022-0057-DWQ, NPDES No. CAS000002, issued by the California State Water Resources Control Board. Section V.C.1 requires the discharger to retain a Qualified SWPPP Developer, a QSD, from the beginning of the project through Notice of Termination approval. That is the full life of coverage, not just the drafting stage. Section 1641 goes further and requires the QSD's own signature on the SWPPP before it is valid. The plan is not a QSD's plan because a QSD once looked at it. It is a QSD's plan because a QSD signed it, under a retention that is supposed to run for as long as the permit does.

The same permit separately requires a Qualified SWPPP Practitioner, a QSP, for implementation and inspections. That is a different function with a different exam, a different set of continuing education hours, and a different reason to exist: somebody has to be on the ground checking that the plan the QSD signed is actually what is happening on the ground, on the schedule the permit sets, with a written record behind every visit.

Why the split exists at all

Design and site oversight are different skills exercised at different points in a project. A QSD needs to understand hydrology, site grading and how to translate both into a compliant plan before a shovel goes in the ground. A QSP needs to be able to walk a site after a storm, recognise a failing control, and write it up correctly the same day. Requiring one credential to cover both would either water down the design standard or turn every inspection into a scheduling problem for a person who is usually off doing design work elsewhere. Keeping them separate lets each credential specialise in what it actually tests.

One person, two credentials, or two people

Nothing stops a single qualified individual from holding both credentials and doing both jobs on a small project. CASQA's own QSD/QSP programme page confirms that meeting the QSD qualification requirements also satisfies the QSP qualification requirements, so a working QSD does not need to sit a second exam to pick up inspection duties as well. What the permit will not accept is skipping the distinction: a project needs both functions covered, by however many people that takes, and the fact that your designer is highly qualified says nothing about who is doing the inspections.

On a larger job the roles usually do split across two people or two firms, because the QSD's design work is mostly finished before the QSP's inspection cycle really gets going, and staffing a busy design consultant to walk a muddy site every seven days is rarely the efficient answer. Either arrangement satisfies the permit. What does not is a plan that names a QSD and then has inspections carried out, or signed off, by somebody who never qualified as either.

Where this actually goes wrong

• Assuming the QSD relationship covers inspections too. Retaining a QSD to write the plan says nothing about who is contracted to inspect it. That is a separate scope, and it needs a separate, explicit answer.
• Letting the QSD retention lapse mid-project. Section V.C.1's retention runs through Notice of Termination approval, not through submission of the plan. A QSD who did the original design and then moves on leaves the discharger out of compliance the day cover ends, even if nothing else about the site has changed.
• Treating the inspector's competence as informal. A site superintendent who has read the SWPPP is not a QSP. The permit's inspection function has its own qualification, and an inspection carried out by somebody who never sat the exam is not the inspection the permit describes, whatever the report says.
• Confusing this with who is allowed to prepare the plan. Eligibility, meaning which underlying licences and training routes qualify someone to become a QSD in the first place, is a separate question with its own detail. Basinwise covers it in who actually qualifies to prepare a SWPPP.

California's industrial permit has its own version of this

If your site is not construction but an industrial facility, the credential you meet is not a QSD or QSP at all. California's Industrial General Permit runs on its own related credential, the QISP, administered under a separate training programme through the State Water Resources Control Board. Do not carry a construction site's QSD or QSP answer across to an industrial one. The permits, the training and the qualifying exams are not the same, even though the underlying idea, a trained person responsible for stormwater compliance, rhymes.

None of this tells you whether your state even requires either credential, or whether you personally qualify to hold one. Basinwise's state credential page for California sets out the current, sourced answer for this state, and Do I need a QSD walks the eligibility question specifically. If you are still working out whether your site needs a permit at all, start with California's stormwater permit page or run your project through the screening tool.