Tap Truth EPA drinking water records, in plain English

County drinking water records

McHenry County, IL drinking water systems

33 community water systems serve McHenry County, IL, reporting 259,521 people served in all. A system that also serves other counties counts all of its customers here.

5 of them (15%) had at least one health-based violation in the last 10 years. 13 systems still have one unresolved.

33 rely mainly on groundwater, counting water bought from other systems.

32 systems filed a lead service line inventory listing 14,982 lead lines, 991 galvanized lines that must be replaced and 6,183 lines of unknown material.

1 more system is placed in McHenry County, IL by the county its records name because it has no service area map that lines up with its own records, so it is listed apart and not counted here.

Community water systems
33
People served, sum of each system's own figure
259,521
Systems with a health-based violation, last 10 years
5
Systems with one unresolved
13
Lead service lines in inventories
14,982

Water systems serving McHenry County

33 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Crystal Lake Crystal Lake and Lakewood 40,661 Groundwater 0 0 531
Algonquin Algonquin 30,700 Groundwater 0 0 11,809
Lake in the Hills Lake in the Hills 28,661 Groundwater 0 0 0
Huntley Huntley 28,495 Groundwater 1 0 9
Woodstock Woodstock 25,630 Groundwater 1 0 218
McHenry McHenry 22,335 Groundwater 0 1 305
Cary Cary and Trout Valley 17,826 Groundwater 0 1 31
Harvard Harvard 9,469 Groundwater 0 0 1,294
Prairie Path Water Co-Whispering Hills Johnsburg, Spring Grove and 1 more 8,300 Groundwater 1 0 0
Island Lake Island Lake and Port Barrington 8,066 Groundwater 0 0 0
Marengo Marengo 7,572 Groundwater 0 0 14
Fox River Grove Fox River Grove and Lake Barrington 4,702 Groundwater 1 0 549
Lakewood Lakewood 4,267 Groundwater 0 1 0
Wonder Lake Wonder Lake and Bull Valley 3,870 Groundwater 1 1 0
Lakemoor Lakemoor 2,720 Groundwater 0 2 0
Richmond Richmond 2,089 Groundwater 0 0 89
Wonder Lake (Niu) Outside cities and towns 1,950 Groundwater 0 0 0
Aqua Illinois-McHenry Shores McHenry 1,862 Groundwater 0 0 0
Hebron Hebron 1,368 Groundwater 0 2 28
Prairie Path Water Company-Killarney Prairie Grove and land outside it 1,232 Groundwater 0 0 0
Johnsburg NO.2 Johnsburg 1,124 Groundwater 0 1 0
Oakbrook Estates MHP Outside cities and towns 1,012 Purchased groundwater 0 1 No inventory
Prairie Path Water Company-Holiday Hills Holiday Hills and land outside it 868 Groundwater 0 0 0
Aqua Illinois-Crystal Clear Water Co. Outside cities and towns 855 Groundwater 0 0 0
Prairie Path Water Company-Walk Up Woods Outside cities and towns 775 Groundwater 0 0 0
Aqua Illinois-Eastwood Manor Outside cities and towns 728 Groundwater 0 4 0
IL American-Terra Cotta Prairie Grove 681 Groundwater 0 0 0
Union Union 594 Groundwater 0 1 105
Aqua Illinois-Nunda Outside cities and towns 485 Groundwater 0 0 0
Johnsburg 1 Johnsburg 174 Groundwater 0 1 0
Royal Oaks MHP Outside cities and towns 170 Groundwater 0 1 0
Prairie Ridge Association Outside cities and towns 148 Groundwater 0 0 0
Harbor Lites-Pistakee FSHG CL Outside cities and towns 132 Groundwater 0 1 0

Systems placed by county record in McHenry County

1 system

EPA has no service area map for this system. It is placed by the county its records name (the counties EPA lists it serving, or the county coded in its ID where EPA lists none), and without a map it is not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Valley Hi Nursing Home County on record 125 Groundwater 0 1 0

Cities and towns in McHenry County

24 places

Back to Illinois

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations