California Well Water Testing and Treatment Contractors

Find qualified Well Water Testing and Treatment contractors in California using our contractor lookup tool. Learn more about NGWA Contractor Certifications here.

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Kings River Drilling

Contractors Company
1650 S Rainbow Ave
Sanger, CA 93657-8922
United States
(559) 994-0653

Belknap Pump Co Inc

Contractors Company
38193 Road 76
Dinuba, CA 93618-9740
United States
(559) 591-4241

Arthur & Orum Well Drilling

Contractors Company
14870 S East Ave
Fresno, CA 93725
(209) 896-5369

Cal Gro Pump Service Inc

Contractors Company
9817 W Grove Ave
Visalia, CA 93291
United States
(559) 651-0802

Myers Well Drilling

Contractors Company
11745 2nd Ave
Hanford, CA 93230-9372
United States
(559) 582-1580

Myers Bros Well Drilling Inc

Contractors Company
PO Box 1283
Hanford, CA 93232-1283
(559) 582-9031

Kaweah Pump Inc

Contractors Company
15499 Avenue 280
Visalia, CA 93292-9718
United States
(559) 747-0755

Madera Pumps

Contractors Company
11884 Road 29
Madera, CA 93637
United States
(559) 517-6303

King Pump & Well

Contractors Company
13821 W Lacey Blvd
Hanford, CA 93230
United States
(559) 816-4148

Willitts Equipment Co Inc

Contractors Company
PO Box 1110
Exeter, CA 93221-7110
United States
(559) 594-5020

Haynes & Sons Well Drilling

Contractors Company
13827 Houston Ave
Hanford, CA 93230-9225
United States
(559) 582-9355

Anderson Pump Co

Contractors Company
PO Box 906
Chowchilla, CA 93610-0906
United States
(559) 665-4477

Diversified Drilling

Contractors Company
PO Box 968
Porterville, CA 93258
United States
(661) 268-1881

WPI Water Resources Inc

Contractors Company
PO Box 11139
Terra Bella, CA 93270-1139
United States

Dos Palos Well Drilling

Contractors Company
2028 Blossom St
Dos Palos, CA 93620-2312
United States
(209) 392-3977

Find Well Water Testing and Treatment In

Frequently Asked Questions

When should I have my well water tested?

The National Ground Water Association (NGWA) recommends well owners test their water at least annually for bacteria, nitrates, and any contaminants of local concern. More frequent testing should be considered if:

  • There is a change in the taste, odor, or appearance of the well water, or if a problem occurs such as a broken well cap, inundation by floodwaters, or a new contamination source
  • The well has a history of bacterial contamination
  • The septic system has recently malfunctioned
  • Family members or house guests have recurrent incidents of gastrointestinal illness
  • An infant is living in the home, or
  • To monitor the efficiency and performance of home water treatment equipment.

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What can impact groundwater quality?

Forty-seven percent of the United States depend on groundwater for their basic drinking water supply. Having a basic understanding about groundwater quality will help ensure that your well is supplying potable water for your household.

Along with human activities, water quality is affected by a combination of natural processes. Most relate to chemical compositions underground. However, other factors such as biological, physical, and radiological conditions can affect water quality as well.

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How is a well disinfected?

Properly constructed and maintained water well systems are designed to keep microorganisms such as bacteria, viruses, and protozoa from getting inside the well system and into the water. When a water test indicates the presence of microorganisms in a well, disinfection of the well system is recommended along with some level of inspection.

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California Groundwater and Water Well Statistics

Few states can accurately or confidentially determine how many residential wells are in place. For each region, the American Housing Survey by the U.S. Census provides regional data.

California is found in the West, along with these other states: Alaska, Hawaii, Washington, Oregon, California, Idaho, Utah, Nevada, Arizona, New Mexico, Colorado, Wyoming, and Montana.

The last American Housing Survey Census indicates this region had 1,540,0002 households served by residential wells, with an average of 2.973 persons per household. The USGS estimates the population of self-supplied water supply users in California to be 1,440,000 for which groundwater is 85% of their water source.

  • 2,081 community water systems use groundwater for 7,286,000 people
  • 1,393 non-community, non-transient water systems use groundwater for 371,400 people
  • 2,874 non-community, transient water systems use groundwater for 603,200 people
  • 59,500 irrigation wells used serving 23,600 farms and 3,860,000 acres

Well Water Testing and Treatment Articles and Resources

Does My Water Well Need Treatment? By Gary L. Hix, R.G., CWD/PI Have you ever asked yourself: “Does my well water need treatment?” The question is not one you can answer if you have not had your water tested recently. You should ask yourself instead: “When was the last time I had my water tested?” If the answer to this question […]

PFAS and Private Well Owners: What You Need to Know NGWA published PFAS and Private Well Owners: What You Need to Know, a two-page fact sheet for home owners concerned about PFAS. Written in easy-to-understand language by groundwater professionals, it explains what PFAS are, how to test wells for PFAS, treatment options, and more.