Water Quality in Mequon, WI (53092)
EPA violation data for public water systems serving ZIP code 53092.
Active Health Violations
10 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 93% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
20,886
Population
239
Water Systems
64
Violations (5yr)
10
Health-Based
Location
Loading map...
Water Systems Serving This Area (239)
Mequon Water Utility
Purchased surface water 11,152 people served
0 violations
Lead tested: 0.52 ppb (limit: 15 ppb) ✓
Homestead High School
All resolved Groundwater 1,650 people served
2 violations (5yr)
· All resolved
Lead tested: 2.4 ppb (limit: 15 ppb) ✓
Concordia University
All resolved Groundwater 1,500 people served
1 violation (5yr)
· All resolved
Lead tested: 0.3 ppb (limit: 15 ppb) ✓
M A T C North Campus
Groundwater 1,200 people served
0 violations
Pavilion Shopping Ctr In Mequon
Groundwater 1,200 people served
0 violations
We Energies 3
Purchased surface water 863 people served
0 violations
Wilson School
Groundwater 722 people served
0 violations
Mequon City Hall
Groundwater 617 people served
0 violations
Mequon Trail Townhomes
1 health-based Groundwater 615 people served
4 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Ozaukee Country Club Clubhouse
Groundwater 575 people served
0 violations
Christ Alone Lutheran School & Church
Groundwater 559 people served
0 violations
Lead tested: 6.2 ppb (limit: 15 ppb) ✓
Oriole Lane School
Groundwater 558 people served
0 violations
Donges Bay School
Groundwater 546 people served
0 violations
Lumen Christi - Mequon Campus
Groundwater 530 people served
0 violations
Ozaukee Country Club Maintenance Building
Groundwater 525 people served
0 violations
Steffen Middle School
Groundwater 515 people served
0 violations
Waynes Drive-In
Groundwater 510 people served
0 violations
Missing Links Golf Range
Groundwater 502 people served
0 violations
Alliance Bible Church
Groundwater 457 people served
0 violations
Village Bp
Groundwater 452 people served
0 violations
River Barn Park
Groundwater 450 people served
0 violations
Lake Shore Middle School
Groundwater 447 people served
0 violations
Glen Oaks Office Park
Groundwater 400 people served
0 violations
Lead tested: 0.2 ppb (limit: 15 ppb) ✓
Chalet On The Lake
Groundwater 400 people served
0 violations
Hb Performance Systems Inc
Groundwater 315 people served
0 violations
Lead tested: 0.84 ppb (limit: 15 ppb) ✓
J Mobil Mequon
Groundwater 304 people served
0 violations
Lakeside Development Co
Groundwater 303 people served
0 violations
Lumen Christi - Thiensville Campus
Groundwater 300 people served
0 violations
Westchester Lakes Subdivision
Groundwater 300 people served
0 violations
Lead tested: 0.56 ppb (limit: 15 ppb) ✓
Kingdom Hall Jehovahs Witnesses - Mequon
Groundwater 300 people served
0 violations
Beautiful Savior Lutheran Church
Groundwater 300 people served
0 violations
Century Estates 3
Groundwater 300 people served
0 violations
We Energies 2
Purchased surface water 290 people served
0 violations
Range Line Preschool & Childcare
Groundwater 270 people served
0 violations
Finn Mcgoos
Groundwater 270 people served
0 violations
Park Place Subdivision
Groundwater 260 people served
0 violations
Lead tested: 0.47 ppb (limit: 15 ppb) ✓
Reuter Pavilion
Groundwater 250 people served
0 violations
Riversite
Groundwater 250 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Boders On The River
Groundwater 215 people served
0 violations
Freddys Custard
Groundwater 210 people served
0 violations
Christian Life Church & Kids Rule Academy
Groundwater 210 people served
0 violations
Lead tested: 4.45 ppb (limit: 15 ppb) ✓
Christ Church Evangelical Lutheran
Groundwater 209 people served
0 violations
The Highland House
Groundwater 205 people served
0 violations
Chucks Place
Groundwater 204 people served
0 violations
Centennial Bar & Grill
Groundwater 204 people served
0 violations
Center For Jewish Life
Groundwater 200 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
River Club Mequon
Groundwater 200 people served
0 violations
Highland House
Groundwater 200 people served
0 violations
Haddonstone Subdivision
Groundwater 195 people served
0 violations
Lead tested: 0.31 ppb (limit: 15 ppb) ✓
We Energies 1- Cedar Gables Cond Assoc
Groundwater 180 people served
0 violations
Wisconsin Lutheran Seminary
Groundwater 175 people served
0 violations
Mequon Umc & North Shore Preschool
All resolved Groundwater 174 people served
12 violations (5yr)
· All resolved
Lead tested: 1.55 ppb (limit: 15 ppb) ✓
Squires I
All resolved Groundwater 172 people served
1 violation (5yr)
· All resolved
Lead tested: 1.65 ppb (limit: 15 ppb) ✓
Mequon Elite
Groundwater 170 people served
0 violations
Bays Nail Spa
Groundwater 170 people served
0 violations
Country Terrace Condo Homes
Groundwater 160 people served
0 violations
Lead tested: 2.85 ppb (limit: 15 ppb) ✓
Dr Dawg
Groundwater 156 people served
0 violations
Milas Bakery
Groundwater 155 people served
0 violations
We Energies -Century Estates 2
Purchased surface water 150 people served
0 violations
We Energies - River Glen
Purchased surface water 150 people served
0 violations
Scannell Investments
Groundwater 140 people served
0 violations
Yellow Rock Real Estate
Groundwater 135 people served
0 violations
Lead tested: 0.99 ppb (limit: 15 ppb) ✓
East Towne Square 1340
Groundwater 130 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Village Heights
Groundwater 130 people served
1 violation (5yr)
Lead tested: 0.47 ppb (limit: 15 ppb) ✓
Vintage Estates
1 health-based Groundwater 130 people served
4 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Century Estates 1
Groundwater 130 people served
0 violations
Lead tested: 0.72 ppb (limit: 15 ppb) ✓
Homestead Hs Pavilion
All resolved Groundwater 125 people served
1 violation (5yr)
· All resolved
Lead tested: 0.38 ppb (limit: 15 ppb) ✓
Kenilworth Subd
Groundwater 120 people served
0 violations
Lead tested: 0.16 ppb (limit: 15 ppb) ✓
Crossroads Of Mequon
Groundwater 119 people served
0 violations
We Energies 1 - Heritage Estates
Groundwater 115 people served
0 violations
East Towne Square 11025 N Port Washington
Groundwater 115 people served
0 violations
Core Consulting Baaree
Groundwater 110 people served
0 violations
North Shore Country Club Pro Shop
Groundwater 110 people served
0 violations
Kelch Corp Injection Div
Groundwater 110 people served
0 violations
Mequon On The Square Condominium Owners Association Inc
Groundwater 110 people served
0 violations
Lead tested: 0.5 ppb (limit: 15 ppb) ✓
Prime Minister Family Restaurant
Groundwater 107 people served
0 violations
We Energies 1 - Country Squire Estates Subd
Purchased surface water 106 people served
0 violations
Jalapeno Loco
Groundwater 104 people served
0 violations
Libby Montana
Groundwater 100 people served
0 violations
Bella Via Dance Studio
Groundwater 100 people served
0 violations
Jorgensen Conveyors Inc
Groundwater 100 people served
0 violations
Lead tested: 2.1 ppb (limit: 15 ppb) ✓
Ferrantes
Groundwater 100 people served
0 violations
River Lake Subdivision
All resolved Groundwater 100 people served
2 violations (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Grace Lutheran
Groundwater 100 people served
0 violations
Ravine Farms Hm Owners Assoc
All resolved Groundwater 100 people served
1 violation (5yr)
· All resolved
Lead tested: 0.57 ppb (limit: 15 ppb) ✓
Mequon Office Complex 11516 Bldg
2 health-based Groundwater 100 people served
3 violations (5yr)
· 2 health-based · All resolved
Lead tested: 0.15 ppb (limit: 15 ppb) ✓
Kellys
Groundwater 100 people served
0 violations
Erons Club Riversite
Groundwater 100 people served
0 violations
Albaneses Of Mequon
Groundwater 100 people served
0 violations
Wyngate Subdivision
Groundwater 100 people served
0 violations
Lead tested: 0.49 ppb (limit: 15 ppb) ✓
Mequon Office Complex 11514 Bldg
Groundwater 100 people served
0 violations
Lead tested: 0.51 ppb (limit: 15 ppb) ✓
Norscot Group Inc
Groundwater 100 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Bel Mar Offices I & Ii
Groundwater 99 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Ozaukee Daycare Center - Ulao 2
Groundwater 98 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
New World Montessori School
Groundwater 96 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Childrens World Learning Ctr Mequon
Groundwater 96 people served
0 violations
Sommers Inc
Groundwater 95 people served
0 violations
Remingtons River Inn
Groundwater 93 people served
0 violations
Suburban Motors
Groundwater 90 people served
0 violations
Thiensville Professional Park
Groundwater 90 people served
0 violations
Lead tested: 3.65 ppb (limit: 15 ppb) ✓
Lakeside Development East & West Bldgs
Groundwater 88 people served
0 violations
Lead tested: 0.6 ppb (limit: 15 ppb) ✓
Five Corners Retail
Groundwater 87 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Crossroads Presbyterian Church & Preschool
Groundwater 86 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
River Trails Estates Water Users
1 health-based Groundwater 84 people served
4 violations (5yr)
· 1 health-based
Lead tested: 0.47 ppb (limit: 15 ppb) ✓
Lake Country Apartments
Groundwater 84 people served
2 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓
Willow Glen Apartments
2 health-based Groundwater 80 people served
6 violations (5yr)
· 2 health-based
Lead tested: 1.22 ppb (limit: 15 ppb) ✓
Super Sky Products Inc
Groundwater 78 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Glaze
Groundwater 77 people served
0 violations
St Johns Lutheran Church
Groundwater 76 people served
0 violations
Elm Grove Terrace
Groundwater 75 people served
0 violations
Lead tested: 0.39 ppb (limit: 15 ppb) ✓
Range Line Inn
1 health-based Groundwater 75 people served
1 violation (5yr)
· 1 health-based
Alberta Subdivision
All resolved Groundwater 75 people served
7 violations (5yr)
· All resolved
Lead tested: 0.48 ppb (limit: 15 ppb) ✓
East Towne Square 1505 W Mequon Road
Groundwater 75 people served
0 violations
North Shore Preschool & Child Care
Groundwater 72 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Granite Microsystems
Groundwater 70 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Dp Properties
Groundwater 65 people served
0 violations
Genmet Corp
Groundwater 65 people served
0 violations
Lead tested: 0.45 ppb (limit: 15 ppb) ✓
Skygen Usa
Groundwater 64 people served
0 violations
Lead tested: 0.49 ppb (limit: 15 ppb) ✓
Toast
Groundwater 63 people served
0 violations
We Energies - Pine Ridge Estates
Purchased surface water 63 people served
0 violations
Johnson Level & Tool
Groundwater 60 people served
0 violations
Mequon Parc Apartments Llc
Groundwater 60 people served
3 violations (5yr)
Lead tested: 0.7 ppb (limit: 15 ppb) ✓
New Day Inc
Groundwater 56 people served
0 violations
East Field Office Center
Groundwater 56 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Galleria Offices
Groundwater 55 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Russ Darrow Honda
Groundwater 54 people served
0 violations
Merchants Square
Groundwater 52 people served
0 violations
Village Center - South Middle
Groundwater 52 people served
0 violations
Central Bark Doggy Day Care
Groundwater 52 people served
0 violations
Thiensville Mequon Small Animal Clinic
Groundwater 50 people served
0 violations
The Cheel
Groundwater 50 people served
0 violations
Lemke Park - City Of Mequon
Groundwater 50 people served
0 violations
White Coach Inn
Groundwater 50 people served
0 violations
S & M Service
Groundwater 50 people served
0 violations
Eglehoff Lawn
Groundwater 50 people served
0 violations
Timber Stone Clubhouse Swimming Pool
Groundwater 50 people served
0 violations
East Sun Restaurant
Groundwater 50 people served
0 violations
Lumen Christi Office & K-5
Groundwater 50 people served
0 violations
Waters Edge Condominium Association
All resolved Groundwater 50 people served
1 violation (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Mequon Safety Building
Groundwater 49 people served
0 violations
Concord 1 Fund Llc
Groundwater 48 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Tres Jolie Solace
Groundwater 47 people served
0 violations
Mequon Marketplace Wells Fargo
Groundwater 46 people served
0 violations
East Towne Offices Jv
Groundwater 44 people served
0 violations
Thermoset Inc Original Fid #, Pls Delete
Groundwater 42 people served
0 violations
Mommy & Me Daycare Center / Copy Master
Groundwater 41 people served
0 violations
East Towne Square 11045
Groundwater 40 people served
0 violations
Colour Bowl Salon & Wellness The
Groundwater 40 people served
0 violations
Marathon I Condominium
Purchased surface water 40 people served
0 violations
Do It Best Hardware
Groundwater 40 people served
0 violations
Heart Of The Village Child Care
Groundwater 40 people served
0 violations
Johnson Level & Tool Mfg Co Inc Ef612
Groundwater 39 people served
0 violations
Port Zedler Motel
Groundwater 38 people served
0 violations
S & R Tire
Groundwater 37 people served
0 violations
East Towne Square 1515 W Mequon Road
Groundwater 37 people served
0 violations
Someplace Cheap
Groundwater 37 people served
0 violations
Mcnabb & Risley
Groundwater 36 people served
0 violations
Be More Kind Enterprises
Groundwater 35 people served
0 violations
Snider Mold Co
All resolved Groundwater 35 people served
1 violation (5yr)
· All resolved
Lead tested: 4.9 ppb (limit: 15 ppb) ✓
North Shore Dental
Groundwater 32 people served
0 violations
Stardust Records
Groundwater 32 people served
0 violations
Schaum Publications Inc
Groundwater 32 people served
0 violations
Cde Properties
Groundwater 31 people served
0 violations
St Jacobi Congregational Church
Groundwater 31 people served
0 violations
J J Transport Inc
Groundwater 30 people served
0 violations
Successful Smiles Dental Clinic
Groundwater 30 people served
0 violations
Glen Oaks Tavern
Groundwater 30 people served
0 violations
Shullys Catering
Groundwater 30 people served
0 violations
Tfb Enterprize Property Llc
Groundwater 30 people served
0 violations
Village Glen Apts
Groundwater 30 people served
0 violations
Lead tested: 0.8 ppb (limit: 15 ppb) ✓
Mequon Nature Preserve
Groundwater 29 people served
0 violations
Baymont Inn & Suites
Groundwater 29 people served
0 violations
St Boniface Episcopal Church
Groundwater 28 people served
0 violations
Lead tested: 2.7 ppb (limit: 15 ppb) ✓
Ajax Metal Products North Well
Groundwater 28 people served
0 violations
Lux Dental
Groundwater 28 people served
0 violations
Phillips 66
Groundwater 27 people served
0 violations
Thiensville Family Health Center
Groundwater 27 people served
0 violations
American Legion Bar Post 457
Groundwater 27 people served
0 violations
Ajax Metal Products South Well
Groundwater 27 people served
0 violations
Fiddleheads
Groundwater 27 people served
0 violations
We Energies 1- Columbia Creek Condos
Groundwater 26 people served
0 violations
Mequon Water Trust
1 health-based Groundwater 26 people served
4 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Abraham & Abraham Dental
Groundwater 25 people served
0 violations
Target Communications
Groundwater 25 people served
0 violations
Eastowne Fountains Professional Bldg
Groundwater 25 people served
0 violations
Btk Inc
Groundwater 25 people served
0 violations
Dowd Development
Groundwater 25 people served
0 violations
Mequon Rotary Park
Groundwater 25 people served
0 violations
Doty Building
Groundwater 25 people served
0 violations
R & J Graphics
Groundwater 25 people served
0 violations
Heidel Rd Apts 130
Groundwater 25 people served
0 violations
Tronix Corporation
Groundwater 25 people served
0 violations
Thermoset Inc
Groundwater 25 people served
0 violations
Rep Associates
Groundwater 25 people served
0 violations
Village Pub
Groundwater 25 people served
0 violations
Thiensville Village Garage
Groundwater 25 people served
0 violations
Thermoset Inc Back Well
Groundwater 25 people served
0 violations
Ross Wells
Groundwater 25 people served
0 violations
Brooks Stevens Assoc Museum
Groundwater 25 people served
0 violations
North Shore Country Club Restroom
Groundwater 25 people served
0 violations
Herbst Oil Co Inc
Groundwater 25 people served
0 violations
Bulk Petroleum #2762
Groundwater 25 people served
0 violations
Pheasant Ridge Sportsmans Club - House
Groundwater 25 people served
0 violations
Meer Auto Body
Groundwater 25 people served
0 violations
Thiensville Village Park
Groundwater 25 people served
0 violations
Trinity Ev Lutheran Rectory - Freistadt
Groundwater 25 people served
0 violations
Sommers Inc
Groundwater 25 people served
0 violations
Skippys Sports Pub
Groundwater 25 people served
0 violations
Richardson Automotive
Groundwater 25 people served
0 violations
Cliff Bergen & Associates
Groundwater 25 people served
0 violations
Thiensville Lumber Co
Groundwater 25 people served
0 violations
The Landmark - Mequon
Groundwater 25 people served
0 violations
Prohealth Chiropractic Center
Groundwater 25 people served
0 violations
New Berlin Spur
Groundwater 25 people served
0 violations
Schramka Densow Funeral Home
Groundwater 25 people served
0 violations
North Shore Country Club Maintenance Sho
Groundwater 25 people served
0 violations
Thiensville Village Hall
Groundwater 25 people served
0 violations
Crickets
Groundwater 25 people served
0 violations
Mequon Auto Tech
Groundwater 25 people served
0 violations
Tesseract
Groundwater 25 people served
0 violations
St Johns Lutheran School
Groundwater 25 people served
0 violations
Fagan Property
Groundwater 25 people served
0 violations
Barthel Fruit Farm
Groundwater 25 people served
0 violations
Hy Tech Tool
Groundwater 25 people served
0 violations
Red Barn
Groundwater 25 people served
0 violations
Village Green Condominiums 10206 & 10218
Groundwater 23 people served
0 violations
Larry Laberte Inc
Groundwater 22 people served
0 violations
Laurel Acres
Groundwater 18 people served
0 violations
Menasha Display
Groundwater 17 people served
0 violations
10500 N Pt Wash Rd
Groundwater 15 people served
0 violations
Hand Doctors Of Milwaukee
Groundwater 12 people served
0 violations
Congregation Anshai Lebowitz
Groundwater 11 people served
0 violations
Venture Properties Inc
Groundwater 10 people served
0 violations
U S Post Office Thiensville
1 health-based Groundwater 8 people served
3 violations (5yr)
· 1 health-based · All resolved
Copper tested: 1640.5 ppb (limit: 1300 ppb) Lead tested: 11.35 ppb (limit: 15 ppb) ✓
Johnson Level & Tool Mfg Co Inc
Groundwater 7 people served
0 violations
North Shore Professional Building
Groundwater 5 people served
0 violations
Scan Pac Manufacturing
Groundwater 4 people served
0 violations
Chabad Of North Shore Rabbis Home
Groundwater 2 people served
0 violations
Charter Manufacturing Co
Groundwater 0
0 violations
Contaminants Found
LEAD AND COPPER RULE REVISIONSHealth-Based
13 violations
Has active
Lead and Copper RuleHealth-Based
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
8 violations
Has active
Di(2-ethylhexyl) phthalateHealth-Based
3 violations
All resolved
Groundwater RuleHealth-Based
2 violations
Has active
Public NoticeMonitoring
10 violations
Has active
Revised Total Coliform RuleMonitoring
Missed testing deadlines — not a detection of bacteria.
6 violations
All resolved
BariumMonitoring
1 violation
All resolved
Thallium, TotalMonitoring
1 violation
All resolved
NickelMonitoring
1 violation
All resolved
FluorideMonitoring
1 violation
All resolved
NitriteMonitoring
Similar to nitrate — harmful to infants at high levels.
1 violation
All resolved
Antimony, TotalMonitoring
1 violation
All resolved
ChromiumMonitoring
1 violation
All resolved
MercuryMonitoring
1 violation
All resolved
CadmiumMonitoring
1 violation
All resolved
Nitrate-NitriteMonitoring
1 violation
All resolved
Beryllium, TotalMonitoring
1 violation
All resolved
SeleniumMonitoring
1 violation
All resolved
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
1 violation
All resolved
E. COLIMonitoring
1 violation
All resolved
Lead & Copper Levels
Lead (Pb)
Within limit2.4 ppb measured
Action level: 15 ppb
Sampled: Sep 2025
Copper (Cu)
Exceeds limit1640.5 ppb measured
Action level: 1300 ppb
Sampled: Jun 2022
How Does This Compare?
Mequon (53092) has more violations than 93% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 64.
Fewer violations 93th percentile More violations
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.