Looking for a water treatment pro in Larkspur, CA? Describe your project once and up to three water treatment pros who work in Larkspur and Marin County get back to you with a quote. It's free and there is no obligation.
Larkspur is home to about 12,807 people (2024 Census Bureau estimate), a shrinking community (−1.9% since 2020). With 4,270 people per sq mi, it is a densely built-up area. Hard water, well water and new PFAS limits are making water treatment a common project here.
Larkspur at a glance
- Population (Census Bureau estimate, 2024)
- 12,807 (−1.9% since 2020)
- Rank in California
- 343rd of 482 cities and towns
- Land area
- 3.0 sq mi
- Population density
- 4,270 people per sq mi (densely built-up)
- Type
- City (Larkspur city)
- Main county
- Marin County
What to check before hiring in Larkspur
- 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 Larkspur
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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 Larkspur
How much does water filtration cost in Larkspur, CA?
It depends on the system and installation. Describe your situation: pros who serve Larkspur 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 Larkspur 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.