Looking for a water treatment pro in Half Moon Bay, CA? Describe your project once and up to three water treatment pros who work in Half Moon Bay and San Mateo County get back to you with a quote. It's free and there is no obligation.
Half Moon Bay is home to about 11,324 people (2024 Census Bureau estimate), a shrinking community (−4.0% since 2020). With 1,814 people per sq mi, it is a suburban area. Hard water, well water and new PFAS limits are making water treatment a common project here.
Half Moon Bay at a glance
- Population (Census Bureau estimate, 2024)
- 11,324 (−4.0% since 2020)
- Rank in California
- 357th of 482 cities and towns
- Land area
- 6.2 sq mi
- Population density
- 1,814 people per sq mi (suburban)
- Type
- City (Half Moon Bay city)
- Main county
- San Mateo County
What to check before hiring in Half Moon Bay
- Test first: check your utility's annual water report or test your well.
- Certification: choose NSF/ANSI certified systems.
- Maintenance: ask about filter changes and service costs.
- Price drivers: system type, flow rate, plumbing and maintenance.
Useful official resources
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EPA: PFAS
Official information and guidance.
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NSF: certified water filters
Official information and guidance.
Services available in Half Moon Bay
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Whole house filtration
Point-of-entry filtration for the whole home, sized from a water test.
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Water softener or reverse osmosis
Softener for hard water or reverse osmosis for drinking water.
Frequently asked questions in Half Moon Bay
How much does water filtration cost in Half Moon Bay, CA?
It depends on the system and installation. Describe your situation: pros who serve Half Moon Bay reply with a quote.
Does it need a permit?
Sometimes, for plumbing changes; ask the installer.
How often are filters changed?
It depends on the system and water use; ask for the schedule.
Which water treatment pros will contact me?
Up to three independent water treatment pros who serve Half Moon Bay and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.