Licensed water treatment contractors in San Diego, CA
8 water treatment contractors hold an active licence on the Contractors State License Board (CSLB) register in San Diego, checked 4 Nov 2026: 5 licensed 10 years or more, 100% bonded and none with a complaint or board disclosure on record. Ranked by a published formula; nobody pays to move up.
- Active licences
- 8
- Median time licensed
- 10.3 yrs
- Bonded
- 100%
- Lead-Safe certified
- 0
- Google reviews
- 764
Filled tags sit at the business's Google location; hollow tags show its mailing ZIP code only. Each tag is the theoPros score.
Ranked list
- 1
All Cities Water Treatment Inc
- Licence active
- Bonded
- Workers' comp
- 2
Water Purification Systems Inc
- Licence active
- Bonded
- Works alone
- 3
Triton Water Renewal LLC
- Licence active
- Bonded
- Workers' comp
- 4
Cal - Cool Mechanical
- Licence active
- Bonded
- Workers' comp
- 5
All Pure Water Treatment
- Licence active
- Bonded
- Works alone
- 6
Unicus Water Solutions
- Licence active
- Bonded
- Works alone
- 7
Superior Water
- Licence active
- Bonded
- Workers' comp
- 8
Pure Lab Solutions Inc
- Licence active
- Bonded
- Workers' comp
Questions people ask about water treatment contractors in San Diego
How many licensed water treatment contractors are in San Diego?
8 water treatment contractors hold an active Contractors State License Board (CSLB) licence with a mailing address in San Diego, checked on 4 November 2026. 5 of them have been licensed for 10 years or more.
Does a water treatment contractor need a licence in California?
Yes, when the whole job, labour and materials, costs $1,000 or more or needs a permit. Below that, California's minor-work exemption (B&P Code 7048) applies, but only if they work alone. Look for an active C-55 licence.
How do I check a water treatment contractor's licence in San Diego?
Ask for the licence number and look it up on the CSLB website, or search this page. Every water treatment contractor listed here was matched to an active licence on the CSLB register.
Which water treatment contractors rank highest in San Diego?
By our published formula (years licensed, complaint record, bond and insurance, and Google reviews), the top three are All Cities Water Treatment Inc (98), Water Purification Systems Inc (81), Triton Water Renewal LLC (77). Paying or claiming a listing never changes the order.
How much do water treatment contractors charge in San Diego?
Water treatment contractors in the San Diego-Chula Vista-Carlsbad metro earn a median $21.92 an hour (BLS, May 2025); contractors typically bill about twice the wage to cover insurance, overhead and profit.
Do I need a lead-safe certified water treatment contractor in San Diego?
If your home was built before 1978 and the work disturbs paint, yes: the law requires a firm certified lead-safe by the US Environmental Protection Agency. 50% of homes here were built before 1980 (US Census, ACS 2024 1-year), and 0 of the 8 licensed water treatment contractors listed are certified.