Plumbing repair in Rialto, CA

What Rialto's numbers say about plumbing

Rialto is one of the most established suburbs tracked here — 106,554 people (2025 estimate), up just 2.5% since 2020^[2]. It covers 24.1 square miles (4,420 residents per square mile, the 3rd densest), sits entirely in San Bernardino County, in ZIP codes 92376, 92377, 92316^[3].

With 4% of homes built since 2010 and 44% before 1980^[1], Rialto's plumbing runs from brand-new supply lines and fixtures to aging pipe, original valves and water heaters past their rated life.

Rialto is split across 3 ZIP codes: 92376 (51% of the city's land), 92377 (26% of the city's land), 92316 (16% of the city's land)^[6].

The tracked suburbs closest by are Fontana (4.2 mi W), Rancho Cucamonga (10.2 mi W) and Redlands (13.3 mi E)^[3].

44% of Rialto's 27,973 housing units predate 1980 and 4% went up in 2010 or later^[1] — the 3rd-highest pre-1980 share of the 15 Inland Empire suburbs we cover; nearby, Fontana (28%), Rancho Cucamonga (29%), and Redlands (58%) predate 1980. Houses that old can still have galvanized supply pipe or cast-iron drains — especially the 19% built before 1960.

The biggest single slice — 32% — was built 1980 to 1989, and the median home dates to 1982^[1]. Neighbours from the same era tend to hit the same plumbing problems at the same time.

Water from the sky is plumbing work too: 51 flood or flash-flood reports within 10 miles over 2016–2025^[4], and FEMA logged 6 flood-insurance claims across Rialto's ZIPs^[5]. Homes that take water need working drainage, sump pumps and backflow prevention.

70% of homes heat with utility gas, and 34% of households rent^[1].

Among the 15 suburbs tracked here, Rialto stands out for the lowest share of homes built since 2010 (4%)^[1], the lowest gas-heat share (70%)^[1], the 2nd-most flood reports nearby (51, tied with Rancho Cucamonga)^[4], and the 3rd-highest pre-1980 housing share (44%)^[1].