Critical Period Management Plan

The EAA’s Critical Period Management Plan (CPMP) is designed to ensure reasonably effective conservation efforts by permitted users of the Edwards Aquifer.  The Plan is designed to interrupt permitted withdrawals from the Aquifer through increasing percentage reductions as Aquifer levels or springflow at Comal and San Marcos springs fall to specific lows. Please see our FAQs for more details.

During critical period other restrictions may apply. Check with your local water utility for restrictions in your area.

Online Critical Period Monthly Groundwater Use Reports

You can now submit your Critical Period Monthly Groundwater Use Report using our online form. Click the button below to get started.

Submit Report Via Online Form

Triggers, stages, and reductions

The CPM Plan is divided into four stages of increasing restrictiveness. Triggers—10-day average spring and index well levels—are used to determine stages of mandatory water use reductions. Reduction amounts are calculated based on the number of days a CPM stage is in effect, with reductions increasing as aquifer levels decrease.

During critical period stages, all municipal, industrial, and irrigation users are required to submit withdrawal reports on a monthly basis.

A chart containing Critical Period Triggers (pdf), Stages, and Withdrawal Reductions, critical period tools, and appropriate monthly withdrawal report forms are available to assist you with planning and Critical Period compliance.

To Report Your Usage during Critical Period, Access our critical period online reporting form here.

Critical Period Tools

To better assist you in managing your groundwater withdrawal permit(s), the EAA has developed a full range of online critical period tools, including Critical Period Calculators and a Critical Period Forecast tool.

View Critical Period Tools