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E.S. Babcock & Sons, Inc.ESB has been providing for the collection and testing of stormwater samples since the inception of the stormwater runoff program. Our laboratory and its partners provide complete analytical services for the NPDES programs administered by the State Water Quality Control Board for:

  • Industrial Stormwater
  • Construction Activities
  • Municipalities
  • Caltrans

Industrial Stormwater

On October 1st, the "wet season" officially begins, and those who have stormwater permits issued by one of the California Regional Water Quality Control Boards will have to sample at least two storm events before the end of May. As detailed in each General Permit Holder’s Storm Water Pollution Prevention Plan (SWPPP), the tests required for all facilities include:

  • Total Suspended Solids
  • pH
  • Oil & Grease or Total Organic Carbon
  • Specific Electrical Conductance

Additional tests are determined by the category of the industry (SIC) and the contaminants most likely to be found in runoff from the location.

We can provide sample kits and recommend orders are placed in advance of the October 1st starting date. To order a sampling kit, please send your list of analytes to: or visit our bottle order page.


Dischargers whose projects disturb one or more acres of soil or whose projects disturb less than one acre but are part of a larger common plan of development that in total disturbs one or more acres, are required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity Construction General Permit Order 2009-0009-DWQ. Construction activity subject to this permit includes clearing, grading and disturbances to the ground such as stockpiling, or excavation, but does not include regular maintenance activities performed to restore the original line, grade, or capacity of the facility.

The Construction General Permit requires the development and implementation of a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP should contain a site map(s) which shows the construction site perimeter, existing and proposed buildings, lots, roadways, storm water collection and discharge points, general topography both before and after construction, and drainage patterns across the project. The SWPPP must list Best Management Practices (BMPs) the discharger will use to protect storm water runoff and the placement of those BMPs. Additionally, the SWPPP must contain a visual monitoring program; a chemical monitoring program for "non-visible" pollutants to be implemented if there is a failure of BMPs; and a sediment monitoring plan if the site discharges directly to a water body listed on the 303(d) list for sediment.  Section A of the Construction General Permit describes the elements that must be contained in a SWPPP.

If a single project traverses more than one Regional Water Quality Control Board (RWQCB) jurisdiction, a complete Notice of Intent package (Notice of Intent, site map, and fee) and Notice of Termination (upon completion of each section), must be filed for each RWQCB.

ESB offers laboratory testing to meet the requirements of the Construction Storm Water Program.  Please contact your Project Manager for more details.

Municipalities & Caltrans

Our laboratory also works with many cities, counties and the transportation department to meet the monitoring needs of their Stormwater programs. We provide compositing and maintenance of automated sampler equipment in conjunction with the analytical reporting required.

For additional stormwater information from the California Regional Water Quality Control Board, visit their website at: You may also contact the local Regional Water Quality Control Board Office in Riverside, California (Region 8) at 951-782-4130.

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