How often should a SWPPP be reviewed and updated?

A Storm Water Pollution Prevention Plan (SWPPP) should be reviewed and updated at least annually to ensure that it remains effective and compliant with current regulations and site conditions. This requirement is in place because construction sites and their surrounding environments can change significantly over time due to factors like weather events, new developments, or alterations in land use that might impact the effectiveness of erosion and sediment control measures.

Regular annual reviews help identify any deficiencies in the existing plan and provide opportunities to make necessary adjustments or improvements. This proactive approach not only aids in compliance with regulatory requirements but also enhances environmental protection efforts by making sure that the strategies in place adequately mitigate the risk of pollution from stormwater runoff.

The other options fall short because reviewing every five years may not be frequent enough given that conditions can change rapidly. Only reviewing when a violation occurs or at the completion of construction fails to account for ongoing changes and potential risks during the project's lifespan, leaving the site vulnerable to environmental harm.