What people mean by the Mile Square Park area
Mile Square Regional Park covers 640 acres, exactly one square mile. Edinger Avenue forms its northern edge, Warner Avenue its southern edge, Brookhurst Street its west side and Euclid Street its east side. OC Parks runs the east section and the City of Fountain Valley runs the west section.
The Navy bought the land in 1942 for a landing field, and military flying there ended in 1974. The first phase of the park opened in 1970. Most of Fountain Valley's housing was built in the 1960s and 1970s, the same decades in which the park took shape.
We did not find an official city neighborhood boundary for this area. We use the park and its four edge streets as a simple locator, not as a district the city has defined.
Four things to know before you call
These notes use public sources. Where a number covers the whole city, we say so.
The streets around the park
Brookhurst, Warner, Euclid and Edinger give you an easy way to say where you are. If your address is near the edge of the park area, give your full street address so the city can be confirmed.
Housing in Fountain Valley
The city's Housing Element draft counts 18,469 housing units, with about 82 percent built before 1980. Roughly three quarters are single-family homes and about 23 percent are multifamily. These are citywide figures, so ask about the age of your own building.
Apartments and condos near Warner Avenue
Listing sites describe several apartment communities with Warner Avenue addresses as across from the park. In a multi-unit building, one drain or supply line may serve more than one home, so the first call is often to the property manager or the HOA.
Hard water
The city's 2026 water quality report lists average hardness of 13 grains per gallon, with a range of 10 to 15. That is a citywide figure. Scale can build up on heating elements and fixtures, which matters when you read about water heater repair.
Plumbing question near the park?
Call and give your full street address.
Jobs this page can help you think through
Plumbing problems look much the same in any Fountain Valley home. These are the ones people ask about most often, with links to the full guides.
Water heaters
Lukewarm water, rumbling or a damp spot near the tank are the usual signs. Read about water heater repair and replacement before you decide.
Slow or blocked drains
One slow sink is a different problem from several fixtures backing up at once. Drain cleaning covers the first, and the second may call for a sewer camera inspection.
Hidden leaks
A water bill that jumps, a damp wall or the sound of water running when everything is off all point to a leak. See leak detection for how plumbers find one.
Toilets and faucets
Running toilets and dripping faucets are everyday repairs in homes of any age. See toilet repair and faucet repair.
Owner, renter or HOA: who to call first
If you own a single-family home, the point where the city's responsibility ends and yours begins depends on the line involved. Ask the City of Fountain Valley about your address before you pay for a large repair.
If you rent, tell your landlord in writing and shut the water off at the fixture if you can. Who pays depends on your lease and on state law, and we cannot decide that for you.
Condo and townhome associations often split responsibility between the association and the owner. Read your governing documents before you call anyone, because the answer decides who should arrange the repair.
Before you call
A few minutes of preparation makes the phone call faster and the visit more useful.
Know your shutoff
Find the main water valve for your home, or the shutoff under the fixture. Ask your manager if you cannot find it.
Note what you see
Write down which fixtures are affected, when it started and whether water is still running.
Take photos
Photograph the problem and any damage before you move anything. Your landlord or insurer may ask for them.
Have your address ready
Give the full street address and any unit number, plus the nearest cross street.
Map of the Mile Square Park Area
The map is centered on the park. It is a locator and not a boundary.
Permits and the city
Some plumbing work, such as a water heater replacement or a repipe, can need a permit. The Fountain Valley Building Division, at 10200 Slater Avenue and 714-593-4429, can tell you what applies to your address.
Keep your invoice and any permit paperwork. They matter when you sell, and some insurers ask for them.
Local note
The park facts come from the public encyclopedia article on Mile Square Regional Park. The housing counts come from the City of Fountain Valley's 2022 Housing Element draft, which uses 2019 American Community Survey figures. The hardness figure comes from the city's 2026 water quality report.
None of these sources defines a neighborhood boundary, which is why this page describes the area by its edge streets.
Source type: Public encyclopedia article, city planning document and city water report
Common Questions
We did not find an official city boundary or neighborhood designation for it. We use the park and its edge streets, Edinger Avenue, Warner Avenue, Brookhurst Street and Euclid Street, as a locator.
Call (714) 750-8637, give your full street address and describe the problem. We will tell you whether we can help at that address.
It depends on your lease and on state and local rules, so we cannot decide for you. Tell your landlord or manager in writing and keep a copy.
The City of Fountain Valley reports an average of 13 grains per gallon citywide, with a range of 10 to 15. Your own tap may differ, so ask the city's water division if you want a figure for your address.
Often yes. The Building Division at 714-593-4429 can tell you what applies to your address, and the plumber can explain the work and the inspection.