CGA Standard Practices

License Terms

Contractor - A Contractor implies an individual or firm who holds a valid California Contractor's license in the classifications of either C-57 or C61/D21. Any contractor member of CGA must be so licensed.

C-57 Contractor - A California Contractor licensed to install and repair water wells and pumps by boring, drilling, excavating, casing, cementing, and cleaning to provide a supply of uncontaminated water.

C-61/D21 - A California Contractor licensed to install and repair water pumps and Contractor - appurtenant materials.

The California Contractor State License Board recommends CGA Standards as study guides for the licensing test.

Standard Practices

CGA’s Standard Practice Series bridges the uncertainties in California State Standards by clearly defining prudent and standard operating procedures, as practiced in the general groundwater industry. Articles are written to fill gaps in the current regulatory scheme and clarify relevant applications and interpretations of regulations.. The Series describes accepted responsibilities of competent, licensed groundwater contractors and is not intended as an instruction manual for an untrained person.		Click here to learn more.
CGA standards are recommended by the CSLB as a study guide. To see a specific standard, click on the standard practice title (PDF) below:

Article	Description
100	Definition of Terms
200	Performance "Guarantees" in Well Drilling Specifications
219	Minimum Thickness of Seals within the Annular Space in Wells Having Gravel Feed Pipes
220	Construction of Gravel Feed Pipes in Wells
225	Gravel Pack Materials and Handling
230	Sand Discharge in Wells
290	Below Grade Well Head Discharge
295	Well Head Casing Extension
299	Destruction of Water Wells
300	Submersible Pump Sizing (small wells)
302	Submersible Pump Sizing (large wells)
320	Backflow Prevention for Agricultural Wells
400	Drift and Alignment Testing
460	Well Yield Pumping Tests 1-4 Residential Connections
480	Geophysical Well Logging
490	Water Well Test Reporting for Property Transactions
495	Well Yield Pumping Tests For Residential Property Transfers
500	Well Disinfection
510	Corrosion Protection
550	Management of Surface Artesian Flows During Vertical Well Construction
580	Destruction of Test Wells or Exploration Holes
Appendix A	Creating, Updating and Amending CGA Standards