Idaho SWPPP Inspection Frequency (Idaho CGP)

Idaho CGP — inspection cadence

The Idaho CGP allows two baseline inspection schedules

The permit states you must conduct site inspections using one of the schedules below, unless your site is subject to the dewatering increase or qualifies for a reduced frequency. The two baseline options are:

Option 1 — Weekly At least once every seven calendar days.

Option 2 — Biweekly + storm trigger days Once every 14 calendar days, and once each day there is a discharge to waters of the U.S. from a storm event of 0.25 inches or greater.

0.25" trigger measurement
The permit ties the 0.25" trigger to a rain gauge kept on-site or a representative weather station, and requires recording rainfall totals for any day during normal business hours that measures 0.25" or more.

Source: Idaho CGP (IDR100000), Section 4.2 (Permit p. 26; PDF p. 29).

Idaho CGP — dewatering

Dewatering discharge increases inspections to daily (for affected areas)

If your site is discharging dewatering water, the permit increases inspection frequency for the portion of the site affected.

Daily inspections when dewatering discharge occurs For sites discharging dewatering water, conduct an inspection once each day the discharge occurs (for the portion of the site affected).

Baseline schedule still applies elsewhere The Section 4.2 inspection frequency still applies to other portions of the site unless a reduced frequency applies.

Source: Idaho CGP (IDR100000), Section 4.3 (Permit p. 26; PDF p. 29).

What to look at

Areas the permit says must be inspected

The Idaho CGP lists minimum areas that must be included during inspections. This is a good “don’t-miss” list even if your project has extra requirements.

Disturbed areas not yet stabilized
All storm water controls (erosion/sediment + pollution prevention controls)
Material / waste / borrow / equipment storage and maintenance areas covered by the permit
Drainageways and flow paths used to divert, convey, and/or treat storm water
All areas where construction dewatering is taking place (including dewatering treatment controls)
All points of discharge from the site
Locations where stabilization measures have been implemented

Safety carve-out
The permit notes you are not required to inspect areas considered unsafe at the time of inspection.

Source: Idaho CGP (IDR100000), Section 4.5 (Permit p. 28; PDF p. 31).

Documentation and close-out

Reports and deadlines that routinely drive compliance

Inspection report timing Complete an inspection report within 24 hours of completing any site inspection.

Rain trigger documentation If an inspection was triggered by rainfall of 0.25" or more, include the rain gauge or weather station readings that triggered the inspection.

Corrective action deadlines (summary)
The permit sets different deadlines depending on the type of fix:

If no new/replacement control or significant repair is needed: complete corrective action by the close of the next business day.
If a new/replacement control or significant repair is needed: complete within seven calendar days (or document infeasibility and schedule).

Sources: Idaho CGP (IDR100000), Section 4.7 (Permit p. 29; PDF p. 32) and Section 5.2 (Permit p. 31; PDF p. 34).

CGP requirements checklist NOI basics Training & permit resources

How Auto-SWPPP fits

Workflow: preview first, finalize after purchase

Before checkout: narrative PDF preview to review scope, assumptions, and control strategy
After purchase: final SWPPP PDF package aligned to an Idaho CGP workflow

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