Critical Period/Drought Management
In times of declining groundwater levels, the EAA implements a Critical Period Management (CPM) Plan to help sustain aquifer and springflow levels. This program helps slow the rate of decline in aquifer levels and spring discharges during periods of little or no rain by reducing the amount of groundwater permit holders may withdraw.
Triggers, Stages and Reductions
During critical periods, all municipal, industrial and irrigation users are required to submit withdrawal reports monthly. These reports are reconciled at the end of the year to ensure permit holder compliance with the CPM reductions.
The EAA has regulatory jurisdiction in all of Bexar, Medina and Uvalde counties and portions of Atascosa, Caldwell, Comal, Guadalupe, and Hays counties.
What is CPM?
The EAA Critical Period Management (CPM) Plan helps sustain aquifer and springflow levels during times of drought by temporarily reducing the authorized withdrawal amounts of Edwards groundwater permit holders. By curbing pumping from the aquifer during periods of little or no rain, this program is designed to slow the rate of decline in aquifer levels and spring discharges until such time that it does rain and the aquifer can recharge itself.
Who does this apply to?
CPM stage reductions apply to all Edwards Aquifer well owners and groundwater permit holders authorized to pump more than three acre-feet annually. This applies to industrial, irrigation, and municipal users, including water utilities authorized to pump Edwards groundwater for delivery to their respective customers*.
In addition, all municipal, industrial and irrigation well owners are required to submit monthly withdrawal reports to the EAA for tracking of their pumping. These reports are reconciled at the end of the year to ensure permit holder compliance with the CPM reductions.
*It should be noted that the EAA does not enforce lawn watering activities or other general water limitations enacted. Any enforcement of such activities or limitations is enforced by a municipality. The EAA does not regulate the public, but instead regulates Edwards well owners with withdrawal permits authorizing their right to pump from the aquifer.
What are the stages of permit reductions and when are they declared?
The CPM Plan is divided into five stages of escalating reduced pumping requirements, each triggered by declining aquifer levels or springflow discharge rates as calculated in 10-day averages. In other words, required reductions increase as aquifer levels or springflows decrease. For example, Stage 1 of CPM is triggered and declared for the San Antonio Pool (all counties within EAA jurisdiction except Uvalde) when the 10-day average level at the J-17 Index Well, in Bexar County, drops below 660 feet above mean sea level (amsl) or the 10-day average spring flow at Comal or San Marcos Springs falls below 225 cubic feet per second (cfs) or 96 cfs, respectively. As a result, permit holders must reduce groundwater withdrawals by 20% of their authorized annual withdrawal amounts based on the number of days CPM is in effect.
See the graphic below for a detailed explanation of permit reductions for each stage of CPM.
Reach out to your water provider to determine if stage restrictions have been declared.
|County||Entity||Address||Main Website Homepage||Website About Critical Period|
|Atascosa||Atascosa Rural Water Supply Corp||10882 Jarratt Rd,
Atascosa, TX 78002
|Bexar||City of Converse||9239 Converse Business Lane
Converse, TX 78109
|Bexar||SWWC Utilities Inc., a Delaware corporation|
|Bexar||City of Shavano Park||900 Saddletree Court
Shavano Park, TX 78231
|Bexar||City of Leon Valley||Maxwell, TX 786566400 El Verde Road
Leon Valley, TX 78238
|Bexar||City of Universal City||52150 Universal City Boulevard
Universal City, TX 78148
|Bexar||City of Alamo Heights||6116 Broadway
San Antonio, TX 78209
|Bexar||City of Selma||City of Selma, TX
9375 Corporate Drive
Selma, TX 78154
|Bexar||City of Live Oak||8001 Shin Oak Dr
Live Oak, TX 78233
|Bexar||City of Kirby||112 Bauman
Kirby, TX 78219
|Bexar||San Antonio Water System||SAWS Main Office
2800 US Hwy 281 N
San Antonio, TX 78212
P: 210-704-SAWS (7297)
8 a.m. – 5 p.m. | M-F
|Bexar||Cadillac Water Corporation||14203 Fairway Basin
San Antonio, 78217
|Comal||City of Garden Ridge||9400 Municipal Parkway
|Comal||Maxwell Water Supply Corporation||216 Main S216 Main Street
Maxwell, TX 78656
|Comal||City of Schertz||City of Schertz
1400 Schertz Parkway
Schertz, TX 78154
|Comal||New Braunfels Utilities||MAIN OFFICE
263 Main Plaza, New Braunfels, TX 78130
355 FM 306, New Braunfels, TX 78130
|Guadalupe||City of Marion||303 S. Center Street
Marion, TX 78124
Monday – Friday
8:00 AM – 5:00 PM
|Guadalupe||Green Valley Special Utility District||529 S. Center Street
Marion, TX 78124
|Hays||City of Kyle||100 W. Center Street
Kyle, TX 78640
|Hays||City of San Marcos||630 E Hopkins
San Marcos, TX 78666
|Hays||County Line Special Utility District||8870 Camino Real
Uhland, Texas 78640
|Hays||Crystal Clear Special Utility District||2370 FM 1979
San Marcos, TX 78666
|Medina||City of Devine||303 South Teel Drive
Devine Texas 78016
|Medina||City of Natalia||P.O. Box 2702078
State Hwy 132 N.
Natalia, TX 78059
Hours of Operation
Open: Monday – Friday
8:00a.m – 4:30p.m. (Closed for lunch between 12:00p.m. – 1:00p.m.)
|Medina||City of Hondo||1600 Ave. M
Hondo, TX 78861
|Medina||City of LaCoste||16004 S. Front St.
La Coste, TX 78039
|Medina||City of Lytle||14916 Main Street
Lytle, TX 78052
|Medina||East Medina County Special Utility District||P.O. Box 628
Devine, TX 78016
|Medina||Yancy Water Supply Corporation||P.O. Box 127
Yancey, TX 78886
|Medina||West Medina Water Supply Corporation||145 CR 526
D’Hanis, TX 78850
|Uvalde||City of Sabinal||Address
501 N. Center Steet,
Sabinal Texas, 78881Mailing Address
P.O. Box 838,
Sabinal, Texas 78881
|Uvalde||City of Uvalde||Address
101 E Main St, Uvalde, TX 78801
Office Hours: M-F 8a.M. – 5 P.M.
|Uvalde||Knippa Water Supply Corp.||P: 830-279-8400|