San Anselmo—Cooling by the Creek

Small Town, Big Heart

Located just 20 miles north of San Francisco, San Anselmo *Spanish for Saint Anslem) is a small, pastoral town with a big heart. The city lies on either side of San Anselmo creek. The natural town’s beauty and resilient spirit makes it a desirable place for people wanting to escape the city and for families seeking a tight-knit community to call home.

Wherever you call home in San Anselmo, Ongaro and Sons open their hearts to ensure your plumbing, heating and cooling systems are in good working order.

Built on a Floodplain

San Anselmo is surrounded by the hills that create Ross Valley. It has a mild climate that stays between the low 50s and mid 70s, but it also has annual rainfall that causes the creek to flood. At least five times in the town’s history, the middle of town filled with more than four feet of heavy rainfall, drenching homes and businesses and costing millions in cleanup and reconstruction.

The town eventually raised the railroad bed to stand between west side homes and the creek. Builders also started placing homes on raised foundations so they could withstand future floods.

According to the city government, “San Anselmo and Sleepy Hollow Creeks periodically flood. This natural process, caused by the clay soils, topography and climate of the Ross Valley has been exacerbated by human development; undersized bridges and buildings that span the creek, railroad berms across the floodplain, and increased impervious surface throughout the watershed.”

If your home floods, your sewer lines as well as your indoor plumbing may be affected. A professional plumber can best assess what remedial actions, if any, need concern you following a flood.

Strong Sense of Community

After the San Francisco Earthquake 1906, many who had lost their homes moved to San Anselmo, in many cases converting their summer homes into their full-time domiciles.

Ongaro and Sons are dedicated to alleviating hardship when it comes to ensuring San Anselmo residents have adequate plumbing, heating and cooling systems in their homes at all times. We provide a 100 percent guarantee of complete customer satisfaction for any work we perform.

Get Schooled in San Anselmo

Residents prioritize education. The San Francisco Theological Seminary has trained graduates since 1892, and the town’s two public school districts have continually high ratings. The San Anselmo Historical Museum, operated by the San Anselmo Historical Commission and the Town of San Anselmo, provides educational materials about the history of San Anselmo.

Ongaro and Sons is also highly committed to educating our customers about maintaining and even DIY repair of their household plumbing, heating and cooling systems. Visit our blog for helpful tips on properly running your appliances and keeping all your utilities running at maximum efficiency.

Arts and Culture

The San Anselmo Art Commission works to provide festivals, galleries and art exhibitions. that add to the cultural character of Ross Valley. It seeks to provide a structure to facilitate the creation of art in all disciplines in the community, promoting and exhibiting art and cultural works produced by Ross Valley artists and promoting art education in the community and schools.

Ongaro and Sons works to facilitate working plumbing, heating and air conditioning in the structures of homes and businesses in San Anselmo. That’s our particular art.

The San Anselmo Art and Wine Festival happens every June. The event draws some 30,000 people, and features over 200 artists, 10 gourmet food booths, live entertainment and a large family area.

Residents proudly display the work of local artists throughout town. Examples include:

Outdoors in San Anselmo

San Anselmo is rated as having one of the best climates in California. Comfortable as it is outdoors, San Anselmo residences and businesses still need effective cooling and heating systems to stay comfortable. Which is why our customers in San Anselmo trust Ongaro and Sons to provide no-risk, guaranteed service.

Of course, when you’re outside, you’re vulnerable to the constant irritants of pollen and other seasonal allergies. For most of us, it is annoying to endure a runny nose or headache caused by allergies. For some, however, allergies can pose a significant health risk.

Ongaro and Sons offers a set of tips to help relieve your allergy suffering. Regular maintenance of your heating and cooling system, such as periodically changing air filters, can make breathing at home more comfortable.

The town has a climate action plan intended to reduce greenhouse gas emissions and attain carbon neutrality no later than 2045. No matter what the air quality outside, Ongaro and Sons can offer products you need to breathe easier indoors.

Ongaro & Sons Services San Anselmo County

Ongaro and Sons provides a full range of plumbing and heating and cooling services to San Anselmo County. When San Anselmo residents call us, they know they’ll receive quality workmanship and incomparable service.


For any and all plumbing jobs related to your home, Ongaro and Sons provides a variety of residential services including inspection, installation and repair. Our technicians are experienced with drain cleaning and maintenance and repair, including installation and repair of garbage disposals. Experienced certified plumbers carefully and thoroughly explore your plumbing, using drain line cameras when necessary, so that we can identify the problems and fix exactly what is wrong.


Ongaro and Sons designs a Heating Ventilation Air Conditioning (HVAC) system using a diagnostics approach to provide the highest levels of efficiency and comfort. Ongaro and Sons technicians are trained for all residential makes and models of forced air and air conditioning repair. Our fully stocked trucks have replacement parts on hand for most required repairs, and if we don’t have the part on hand we can get the part quickly so that you’ll be up and running in a very short time.

Boiler Repair

Ongaro and Sons technicians make use of the latest diagnostic equipment and years of experience to determine a problem quickly and get you back up and running as soon as possible. They are highly trained in boiler repair and regularly attend boiler manufacturers training courses. We work on most all major manufacturer models. Regular boiler system maintenance and annual tune-up ensure longer lasting equipment and lower utility bills. Should your boiler need replacement, we carry most major brands.

Duct Cleaning, Repair and Replacement

Central air conditioning and heating are the top energy consumers in most California homes, so ensuring the efficiency of your entire HVAC system can yield big improvements in energy efficiency. When we think about saving energy, we usually focus on the furnace and air conditioner units, but a leaky duct system can reduce your climate control system’s efficiency 20 to 30 percent. These leaks also  bring unwanted dust, unconditioned outdoor air and humidity into your living space and take money straight out of your wallet.

If your home is over seven years old, have your ducts professionally tested by one of our certified Home Energy Rating System (HERS) technicians via an energy audit. If needed, we can do a thorough and effective cleaning, repair or even replace leaky ductwork.

Indoor Air Quality

Ongaro and Sons puts the “V” back into the HVAC. Ventilation is the process of bringing fresh air into your home to replace stale air filled with indoor pollutants such as cooking smells, pet odors and/or tobacco. Proper ventilation is not only key to the efficiency of your home heating and cooling system, but to your indoor air quality and you and your family’s health. While air filters and air fresheners remove particles from circulating, they don’t bring in fresh air. One simple way to correct this is to open doors and windows, but this is not always practical. It also allows outside allergens and pollutants into the house.

Ongaro and Sons offers a number of solutions to increase the quality of your indoor air, including everything from a filtration system to a complete home purification system and fresh air exchanger system. We’re a family-owned business. No one knows better than us the importance of protecting the health of you and your family.

Contact Us

Living in San Anselmo is all about enjoying all small town life has to offer, but residents still experience everyday headaches when it comes to maintaining their properties and fixing problems. Ongaro and Sons is here for San Anselmo residents as well as commercial businesses to provide full-service heating and pooling, plumbing and boiler installation, maintenance and repair. Contact us with any questions or discuss your needs, and experience 100 percent customer satisfaction.