Plumber in Chino, CA

From dairy town to suburb

Chino was laid out as a town in 1887 and incorporated in 1910, and for much of the 20th century it was dairy country. The dairy business here peaked from the 1950s through the 1980s, when Chino was the biggest milk-producing community in the biggest milk-producing state. The houses came later. The city had about 10,000 people in 1960, 40,000 in 1980 and 60,000 in 1990, and it added roughly 5,400 housing units between 2010 and 2020 alone.

Central Chino

The older neighborhoods around downtown hold much of the city's pre-1970 housing. Unless they've been updated, expect some galvanized water pipe, cast iron drains and clay sewer laterals. These are the homes where low pressure, rusty water and root-clogged main lines are most common.

The 1970s and 1980s tracts

Chino roughly quadrupled between 1960 and 1980 and kept growing through the 1980s, mostly in slab-on-grade tract homes with copper water lines under the floor. That copper is 35 to 55 years old now, which is the age when slab leaks and pinhole leaks become regular calls.

The Preserve

The Preserve is former county dairy land south of Kimball Avenue, between Euclid and Hellman avenues and north of the 71. Chino annexed it in 2003, about 5,400 acres in all, and planned roughly half for homes, businesses and airport-related uses and the other half for open space and agriculture. About 4,800 homes were built and occupied by 2021, and buildout is planned at close to 12,000.

College Park

College Park is a roughly 200-acre master-planned community next to Chaffey College's Chino campus, with homes built mostly since about 2010. Like The Preserve, it has modern plastic drain lines and newer water heaters. The common calls in both are scale, fixture cartridges, water heater maintenance and the occasional builder warranty question.

Chino's water is very hard

The City of Chino's 2025 Water Quality Report shows a blend of two sources. About 73 percent was treated groundwater from city wells and the Chino Basin Desalter Authority. The other 27 percent was State Water Project water treated at the Agua de Lejos plant in Upland.

Hardness varies a lot between them. Water from the city's own wells averaged about 248 mg/L in 2025, roughly 14.5 grains per gallon. That's very hard by any standard. Imported water from Agua de Lejos averaged about 91 mg/L. What reaches your tap is a mix, and with most of it coming from groundwater, it leans hard.

In a Chino house, very hard water shows up as:

• White crust on shower heads, faucets and glass shower doors.
• Tank water heaters filling with sediment, popping and rumbling, and wearing out early.
• Tankless units scaling up and throwing error codes if they aren't descaled.
• Faucet and toilet fill valve parts sticking or leaking sooner than they should.

A water softener or a scale-reduction filter on the water heater line can help. Either one needs to be installed with a bypass so you can service it.

Chino, not Chino Hills

Chino and Chino Hills are separate cities with separate building departments and separate water systems. Plumbing permits for a Chino address come from the City of Chino Building Division. Water heater replacements, repipes and sewer line replacements generally need a permit, and the licensed plumber normally pulls it.

Nearby

North of Chino, Ontario shares the same dairy-preserve history and the Chino Basin Desalter Authority. To the west, past Chino Hills, is Diamond Bar, and to the northwest is Pomona.