Backflow Testing in Michigan
Backflow Testing across Michigan: the 521 ZIP codes and 354 cities we route calls in, and who licenses plumbers in the state.
Free to homeowners in Michigan — the contractor pays us for the introduction, you never do.
Who has to test
Our backflow testing coverage in Michigan runs to 521 ZIP codes in 354 cities. Backflow assemblies are required where a premises can push water back into the main, and in a state of large municipalities that duty is usually written into one city-wide water ordinance that applies the same way across tens of thousands of connections.
Source: coverage area as published by our call partner; place and county names from the US Census Bureau.
We route backflow testing calls in 521 ZIP codes across 354 Michigan cities, in 28 counties.
What this site is
CrossConnect is a referral service, not a contractor. We connect property owners and managers with independent contractors. Backflow assembly testing is normally restricted to testers holding a specific certification and using calibrated equipment, and the report usually has to reach your water purveyor — ask to see the certification and ask who files the report. We carry out no testing, we certify nobody, we do not set prices, and we never charge callers anything. Nothing here selects a device for any installation or states that any assembly is passing.Checking a credential in Michigan
Michigan licenses are issued by the Michigan Bureau of Construction Codes, Department of Licensing and Regulatory Affairs, which publishes a public search you can use before work begins.
18 of the 28 Michigan counties we cover, from the top of the alphabet
- Allegan County 13 ZIP codes
Allegan, Dorr, Douglas, Fennville, Hamilton, Hopkins, Martin, Otsego, Plainwell, Pullman, Saugatuck, Shelbyville, Wayland - Barry County 4 ZIP codes
Delton, Freeport, Hastings, Middleville - Berrien County 23 ZIP codes
Benton Harbor, Baroda, Berrien Center, Berrien Springs, Bridgman, Buchanan, Coloma, Eau Claire, Galien, Harbert, Lakeside, New Buffalo, New Troy, Niles and 8 more - Cass County 7 ZIP codes
Cassopolis, Dowagiac, Edwardsburg, Jones, Marcellus, Union, Vandalia - Clinton County 9 ZIP codes
Bath, DeWitt, Eagle, Elsie, Fowler, Maple Rapids, Ovid, Saint Johns, Westphalia - Eaton County 10 ZIP codes
Bellevue, Charlotte, Dimondale, Eaton Rapids, Grand Ledge, Mulliken, Olivet, Potterville, Sunfield, Vermontville - Genesee County 9 ZIP codes
Grand Blanc, Atlas, Burton, Fenton, Gaines, Goodrich, Linden, Swartz Creek - Ingham County 37 ZIP codes
Lansing, East Lansing, Okemos, Dansville, Haslett, Holt, Leslie, Mason, Onondaga, Stockbridge, Webberville, Williamston - Ionia County 12 ZIP codes
Belding, Clarksville, Hubbardston, Ionia, Lake Odessa, Lyons, Muir, Orleans, Palo, Pewamo, Portland, Saranac - Jackson County 16 ZIP codes
Jackson, Brooklyn, Clarklake, Concord, Grass Lake, Hanover, Horton, Michigan Center, Munith, Napoleon, Norvell, Pleasant Lake, Spring Arbor - Kalamazoo County 5 ZIP codes
Portage, Scotts, Vicksburg - Kent County 28 ZIP codes
Grand Rapids, Wyoming, Ada, Alto, Belmont, Byron Center, Caledonia, Cedar Springs, Comstock Park, Gowen, Grandville, Kent City, Lowell, Rockford and 2 more - Lapeer County 12 ZIP codes
Almont, Attica, Clifford, Columbiaville, Dryden, Hadley, Imlay City, Lapeer, Metamora, North Branch, Otter Lake, Silverwood - Livingston County 12 ZIP codes
Howell, Brighton, Cohoctah, Fowlerville, Gregory, Hamburg, Hartland, Lakeland, Pinckney - Macomb County 41 ZIP codes
Warren, Sterling Heights, Utica, Clinton Township, Saint Clair Shores, Macomb, Mount Clemens, New Baltimore, New Haven, Washington, Armada, Center Line, Eastpointe, Fraser and 5 more - Monroe County 17 ZIP codes
Monroe, Carleton, Dundee, Erie, Ida, La Salle, Lambertville, Luna Pier, Maybee, Milan, Newport, Ottawa Lake, Petersburg, Samaria and 2 more - Montcalm County 4 ZIP codes
Greenville, Howard City, Lakeview, Pierson - Muskegon County 10 ZIP codes
Muskegon, Bailey, Casnovia, Fruitport, Holton, Ravenna, Twin Lake
10 more Michigan counties are inside the coverage area and are not listed here. If your ZIP code is in Michigan, the call reaches a contractor.
What that coverage looks like
The 28 counties in our Michigan footprint are served by many separate water suppliers, and each one decides which premises must test and how often. Oakland County, with 84 covered ZIP codes, is the largest single block of them; Lansing alone holds 22.
How a backflow testing job goes
A backflow test is a scheduled job that ends in a document. The assembly is isolated, the differential across it is measured, the result is written down, and the report goes to whoever requires it. A failed test means a repair or a rebuild and then a re-test; it does not mean the premises closes that day.
What the call asks about backflow testing
- What kind of premises it is and what is connected to the supply — irrigation, a boiler, a fire line, a commercial kitchen.
- Who is asking for the test: a water supplier, a health department, or a landlord.
- Whether there is an existing assembly with a serial number on it, and when it was last tested.
Every Michigan city we route in
125 cities, ordered by the share of buildings with twenty or more units. Containment assemblies are required building by building, and that is where the buildings are. Each page carries that city’s own numbers and the ZIP codes we route there.
- Detroit 94%
- Wixom 24%
- Southfield 22%
- East Lansing 22%
- Highland Park 21%
- Center Line 14%
- Okemos 13%
- Riverview 13%
- Novi 12%
- Ann Arbor 12%
- Pontiac 11%
- Wyoming 11%
- Royal Oak 11%
- Grand Rapids 11%
- Birmingham 10%
- Wayne 10%
- Westland 10%
- Madison Heights 10%
- Lansing 9%
- Saint Joseph 9%
- Auburn Hills 9%
- Clinton Township 9%
- Belleville 9%
- Southgate 9%
- Dundee 9%
- Hazel Park 9%
- Dearborn 8%
- Ypsilanti 8%
- Farmington 8%
- Haslett 8%
- Oak Park 8%
- Fraser 7%
- Harrison Township 7%
- Holly 7%
- Portage 7%
- Comstock Park 7%
- Grand Blanc 7%
- Holt 7%
- Mount Clemens 7%
- Waterford 7%
- New Hudson 7%
- Troy 7%
- Jenison 7%
- Saline 6%
- Melvindale 6%
- Grandville 6%
- Chelsea 6%
- Jackson 6%
- Fort Gratiot 6%
- Sterling Heights 6%
- Spring Lake 6%
- Burton 6%
- Grand Ledge 6%
- Walled Lake 6%
- Ferndale 6%
- Utica 5%
- South Haven 5%
- Marysville 5%
- Allendale 5%
- Three Rivers 5%
- Port Huron 5%
- Monroe 5%
- Ionia 5%
- Benton Harbor 5%
- Greenville 5%
- Plymouth 5%
- Clawson 5%
- Rochester 5%
- Niles 5%
- Muskegon 5%
- Wyandotte 4%
- Owosso 4%
- Fenton 4%
- Holland 4%
- Taylor 4%
- Durand 4%
- Berrien Springs 4%
- West Bloomfield 4%
- Saint Johns 4%
- Belding 4%
- River Rouge 4%
- Lake Orion 4%
- Warren 4%
- Howell 4%
- Grand Haven 4%
- Brighton 4%
- Roseville 4%
- Sturgis 4%
- Berkley 3%
- Temperance 3%
- Portland 3%
- Trenton 3%
- Lincoln Park 3%
- New Baltimore 3%
- Whitmore Lake 3%
- Ecorse 3%
- Milford 3%
- Livonia 3%
- Sparta 3%
- Cassopolis 3%
- Saint Clair 3%
- Bloomfield Hills 3%
- Romulus 3%
- Saint Clair Shores 3%
- Dearborn Heights 3%
- Zeeland 3%
- Canton 3%
- Rockwood 3%
- Harper Woods 3%
- Richmond 3%
- Grosse Pointe 3%
- Eaton Rapids 3%
- Caledonia 3%
- Dowagiac 2%
- Lapeer 2%
- Hamtramck 2%
- Paw Paw 2%
- Northville 2%
- Garden City 2%
- Byron Center 2%
- Imlay City 2%
- Oxford 2%
- Plainwell 2%
- Charlotte 2%
- Allen Park 2%
Before you call
A test is a scheduled job with a report at the end of it, not a repair. What the report has to show, and who it goes to, are on the pages above.
