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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Roadrunner Drilling

Contractors Company
80 Bee Jay Way
Woodland, CA 95776-6004
(530) 406 8559

Desert Empire Drilling

Contractors Company
3890 Lenwood Rd
Barstow, CA 92311-9405
(760) 253-5637

Huckfeldt Well Drilling Inc

Contractors Company
994 Kaiser Rd Ste B
Napa, CA 94558-6224
(707) 255-7923

Oakville Pump Services

Contractors Company
2310 Laurel St Ste 1
Napa, CA 94559
(707) 944-2471

Peters Drilling & Pump Service

Contractors Company
PO Box 1546
Grass Valley, CA 95945-1546
United States
(530) 273-8136

McLean & Williams Inc

Contractors Company
878 El Centro Ave
Napa, CA 94558-1955
(707) 255-6450

Kathi Parks

Contractor Individual
PO Box 494
Zamora, CA 95698-0494
(530) 661-9027

Larbre Well Drilling & Pumps Inc

Contractors Company
18715 Arnold Dr
Sonoma, CA 95476-5201
(707) 996-1819

Nor-Cal Pump & Well Drilling Inc

Contractors Company
1325 Barry Rd
Yuba City, CA 95993
(530) 674-5861

Pumpman LLC

Contractors Company
5020 Bleecker St
Baldwin Park, CA 91706
(626) 939-0300

Arolo Co

Contractors Company
424 Payran St Ste A
Petaluma, CA 94952-5920
(707) 762-4028

General Pump Company Inc

Contractors Company
159 N Acacia St
San Dimas, CA 91773-2585
(909) 599-9606

Jerry & Dons Yager Pump & Well Service

Contractors Company
PO Box 2689
Petaluma, CA 94953-2689
United States
(707) 762-1473

Bartley Pump Inc

Contractors Company
4000 S Moorland Ave
Santa Rosa, CA 95407-8110
(707) 584-9191

Solomon Well Drilling & Pump Service Inc

Contractors Company
PO Box 940
Lucerne Valley, CA 92356-0940
(760) 248-7916

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.