SWPPP Design & Stormwater Management — Bay Area
Call (510) 250-7877 to scope your SWPPP with a QSD-certified civil engineer. We give you a fixed-fee quote for the whole permit lifecycle within one business day.
If your Bay Area project disturbs one acre or more and drains to a storm drain or surface water, you need a stormwater pollution prevention plan before you break ground. Calichi Design Group has prepared SWPPPs for 80+ Bay Area projects under California’s Construction General Permit (Order 2022-0057-DWQ), and we carry the plan through construction to permit closeout.
When you need a SWPPP, and when you don’t
The threshold is one acre of cumulative soil disturbance. Grading, excavation, cut and fill, vegetation removal that exposes soil, road and pavement work, utility trenching, and on-site stockpiling all count toward it. Routine maintenance on already-paved sites generally does not.
Two things catch developers out. First, the acre is cumulative across phases, so a project that starts at 0.7 acres and expands later needs coverage retroactively, with the fines and delays that come with a late filing. Second, some Regional Water Boards apply stricter rules than the state minimum, and some receiving waters carry extra protections, so an under-an-acre project is not automatically exempt.
If you’re still working out whether the requirement applies to you at all, our detailed guide on whether you need a SWPPP walks through the thresholds, risk levels, and exemptions in full. This page is about who prepares it and what you get.
What you get from us
A stormwater pollution prevention plan that an inspector accepts is a site-specific engineering document, not a filled-in template. Every plan we produce includes:
- Erosion potential quantified by RUSLE. We calculate projected soil loss from your actual soil type, slope, rainfall, and cover rather than assuming a risk category.
- Risk Level determination. We compute it with you and document the basis, because the Risk Level drives inspection frequency, treatment requirements, and your construction-phase cost.
- Erosion and sediment control BMP schedule. Which controls go where, and at what point in the construction sequence.
- Treatment BMP design where the Risk Level calls for it: sediment basins, inlet protection, stabilized construction entrances.
- Monitoring and inspection plan. Frequency, responsible party, and the conditions that trigger corrective action.
- Dewatering, concrete washout, spill control, and dust control procedures.
- Post-construction controls where permanent stormwater management is required.
- WDID registration and Water Board correspondence, handled by us rather than handed back to you.
- Site plan mapping and inspection log templates your field crew can actually use.
QSD and QSP: it matters who signs
California requires a Qualified SWPPP Developer to prepare and certify the plan, and a Qualified SWPPP Practitioner to inspect the site while construction runs. Both are CASQA certifications, and they are not the same qualification.
Plenty of stormwater vendors staff QSPs and subcontract the QSD work out. We hold both. The engineer who writes your plan is a licensed civil engineer, which matters when the SWPPP has to reconcile with your grading design, your drainage, and your C.3 obligations rather than sitting beside them as a separate document. We can provide QSP inspections through construction as well, or work alongside a QSP the contractor designates.
Start before you mobilize
Getting permit coverage in place takes roughly five to eight weeks from a standing start: one to two weeks to determine Risk Level, two to four weeks to develop the plan, and one to two weeks to register the WDID and obtain coverage. Regional Board review, where it applies, adds to that.
That timeline is the single most common scheduling mistake we see. Erosion controls have to be active during construction, and post-construction features do not substitute for them, so a SWPPP started the week grading begins has already delayed the job. Bring us in during design and the plan is ready when the equipment is.
Bay Area jurisdictions we work in
We prepare SWPPPs across the nine-county Bay Area under San Francisco Bay Regional Water Quality Control Board jurisdiction, including Alameda, Contra Costa, San Mateo, Santa Clara, and Marin counties. Local municipal stormwater ordinances sit on top of the state permit and vary by city, and the Municipal Regional Stormwater Permit brings its own post-construction obligations that often land on the same project.
Where your project also triggers permanent stormwater requirements, we handle that scope too. See our stormwater management services and our guide to C.3 stormwater requirements.
What drives the fee
SWPPP cost tracks four things: total disturbed acreage, the Risk Level your site falls into, construction duration (which sets how many QSP inspections you’ll need), and whether the project discharges to an impaired or sensitive receiving water. A five-acre flat site with a stable outfall and a twenty-acre hillside site draining to a listed creek are different pieces of work, and quoting them the same way would be guesswork.
Tell us the acreage, the site, and your anticipated start date, and we’ll give you a fixed fee covering plan preparation, registration, inspections, and closeout within one business day. No open-ended hourly billing.
Common questions
Do we need a stormwater pollution prevention plan for a phased project?
Yes, once cumulative disturbance across all phases reaches one acre. Coverage applies retroactively from that point, so if expansion past an acre is likely we recommend filing from the start rather than amending under pressure later.
My project is just under an acre. Am I exempt?
Generally yes under the state permit, but verify before you rely on it. Some Regional Water Boards apply stricter thresholds, and some receiving waters carry additional protections. The calculation is also cumulative, so phased work adds up.
Who has to be the QSD, and can our contractor do it?
The SWPPP must be prepared and certified by a CASQA-certified QSD. A contractor can designate a QSP for field inspections, but the plan itself needs the developer certification.
Can we install treatment BMPs after construction instead?
No. The Construction General Permit requires active erosion and sediment controls while construction is happening. Post-construction features are a separate requirement and do not replace construction-phase controls.
How long until we can close the permit out?
A minimum of 90 days with all disturbed ground paved, planted, or stabilized under permanent cover. Some Regional Boards require longer depending on site conditions.
Can you take over a SWPPP another firm prepared?
Yes. We handle amendments and permit transfers, including sites already under construction where conditions have changed or an inspection has flagged a deficiency.
Get a SWPPP scope proposal
QSD-certified, PE-stamped, and accepted by SFRWQCB inspectors. Tell us about the site and we respond within one business day. For anything urgent, call (510) 250-7877 or email reco@calichi.com.
Get a SWPPP Scope Proposal
QSD-certified. Tell us about the site and we respond within one business day.