Anaheim is Orange County's largest city by population, home to Disneyland Resort, Angel Stadium, and Honda Center.

ZIP: 92801, 92802, 92804, 92805 +3 more

Artesia is small but busy.

ZIP: 90701

Bell is only about 2.

ZIP: 90201

Bell Gardens shares the same 1950s housing stock as its neighbors, plus it has the Bicycle Club casino bringing commercial plumbing needs.

ZIP: 90202

Bellflower is a working-class LA County city where most homes went up in the late 1940s through the 1950s.

ZIP: 90706

Brea is a hillside community in north Orange County known for the Brea Mall and its oil heritage.

ZIP: 92821, 92822, 92823

Buena Park, home to Knott's Berry Farm, is a mid-century community where most homes were built between 1955 and 1975.

ZIP: 90620, 90621, 90622, 90624

Carson was built on former marshland and oil fields, which makes for interesting soil conditions.

ZIP: 90745, 90746, 90747, 90810

Cerritos transformed from dairy farms to tract homes in the 1960s, and those original homes are now pushing 60 years old.

ZIP: 90703

Compton's housing stock goes back to the 1940s and 1950s, with plumbing systems that have been patched and repaired for decades.

ZIP: 90220, 90221, 90222, 90223 +1 more

Costa Mesa sits between the coast and inland Orange County, home to South Coast Plaza and a thriving arts district.

ZIP: 92626, 92627, 92628

Cypress is a compact, family-friendly city in northwest Orange County where most homes were built in the 1960s-1970s.

ZIP: 90630

Downey has that classic mid-century Southern California look, and the plumbing to match.

ZIP: 90239, 90240, 90241, 90242

Fullerton blends college-town energy (Cal State Fullerton, Fullerton College) with established residential neighborhoods.

ZIP: 92831, 92832, 92833, 92835

Garden Grove is a densely populated city in central Orange County known for its diverse community and the Crystal Cathedral.

ZIP: 92840, 92841, 92842, 92843 +2 more

Hawaiian Gardens is LA County's smallest city by area, with a mix of older single-family homes and mobile home parks.

ZIP: 90716

Huntington Beach, known as Surf City USA, faces unique plumbing challenges from its coastal environment.

ZIP: 92646, 92647, 92648, 92649

Huntington Park is one of LA County's oldest and most densely built cities.

ZIP: 90255

Irvine is a master-planned city known for its newer construction and growing population.

ZIP: 92602, 92603, 92604, 92606 +5 more

La Habra sits at the northern edge of Orange County along the LA County border.

ZIP: 90631, 90632, 90633

La Mirada is a quieter LA County suburb that borders Orange County.

ZIP: 90637, 90638

Laguna Niguel is an affluent South Orange County hillside community where homes range from 1970s originals to luxury custom builds.

ZIP: 92677

Lake Forest is a family-oriented South Orange County city with residential developments spanning from the 1970s to present day.

ZIP: 92630

Lakewood is one of the original postwar planned communities.

ZIP: 90711, 90712, 90713, 90714 +1 more

Long Beach is a big city with big plumbing variety.

ZIP: 90801, 90802, 90803, 90804 +8 more

Lynwood is a small city packed with 1940s-1950s homes on compact lots.

ZIP: 90262

Mission Viejo is one of the largest master-planned communities in the US, built primarily in the 1970s-1980s.

ZIP: 92691, 92692

Norwalk sits right in the middle of southeast LA County, surrounded by other postwar suburbs with similar plumbing problems.

ZIP: 90650, 90651

The City of Orange features the charming Old Towne Historic District alongside modern subdivisions.

ZIP: 92856, 92857, 92859, 92862 +5 more

Paramount is a compact city where houses were built fast in the 1940s and 1950s to house workers at nearby factories.

ZIP: 90723

Placentia is a smaller northeast Orange County city with a tight-knit residential feel.

ZIP: 92870, 92871

San Clemente, the 'Spanish Village by the Sea', sits at the southern tip of Orange County.

ZIP: 92672, 92673, 92674

Santa Ana is the county seat of Orange County with a mix of historic and mid-century homes.

ZIP: 92701, 92703, 92704, 92705 +2 more

Signal Hill is that little city surrounded by Long Beach, famous for its oil derricks and hilltop views.

ZIP: 90755

South Gate was a factory town in the 1940s and the worker housing reflects that era.

ZIP: 90280

Torrance covers a lot of ground, from 1930s cottages in Old Torrance to beachside homes in Hollywood Riviera to postwar tracts in Walteria.

ZIP: 90501, 90502, 90503, 90504 +2 more

Tustin combines historic Old Town charm with modern developments on the former Marine Corps Air Station.

ZIP: 92780, 92781, 92782

Westminster is a central Orange County city known for Little Saigon, the largest Vietnamese American community in the US.

ZIP: 92683, 92684, 92685

Whittier has a great mix of historic Uptown homes from the 1920s-1930s and classic California ranches from the 1950s-1960s.

ZIP: 90601, 90602, 90603, 90604 +2 more

Yorba Linda, birthplace of President Richard Nixon, is an upscale residential community in northeast Orange County.

ZIP: 92886, 92887