Tap Truth EPA drinking water records, in plain English

County drinking water records

Boulder County, CO drinking water systems

28 community water systems serve Boulder County, CO, reporting 411,184 people served in all. A system that also serves other counties counts all of its customers here.

10 of them (36%) had at least one health-based violation in the last 10 years. 5 systems still have one unresolved.

7 rely mainly on groundwater and 21 on surface water, counting water bought from other systems.

26 systems filed a lead service line inventory listing 1 lead line, 10 galvanized lines that must be replaced and 5,901 lines of unknown material.

13 more systems are placed in Boulder County, CO by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
28
People served, sum of each system's own figure
411,184
Systems with a health-based violation, last 10 years
10
Systems with one unresolved
5
Lead service lines in inventories
1

Water systems serving Boulder County

28 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
City of Boulder Boulder and Gunbarrel 166,080 Surface water 2 0 0
City of Longmont Longmont 102,866 Surface water 0 0 0
Town of Erie Erie 40,061 Surface water 0 0 0
City of Lafayette Lafayette and Paragon Estates 28,700 Surface water 0 0 1
City of Louisville Louisville 20,975 Surface water 2 0 0
Left Hand WD Frederick, Niwot and 2 more and land outside them 20,280 Surface water 0 0 0
Superior MD No 1 Superior 17,900 Surface water 2 0 0
Town of Lyons Lyons 2,990 Purchased surface water 0 0 0
Town of Nederland Nederland 2,406 Surface water 0 0 0
Boulder Meadows MHP Outside cities and towns 1,657 Purchased surface water 0 0 0
Pine Brook Hills WD Pine Brook Hill 1,100 Surface water 0 0 0
Mile Hi Water Inc Hauler Outside cities and towns 1,000 Purchased surface water 3 1 No inventory
San Lazaro MFCTD Housing Community Outside cities and towns 844 Surface water 3 1 0
Baseline WD Outside cities and towns 820 Purchased surface water 0 0 0
Hoover Hills WSD Outside cities and towns 662 Purchased surface water 0 0 0
Shannon WSD Outside cities and towns 450 Groundwater 0 0 0
Allenspark WSD Allenspark 340 Surface water 3 0 0
Eldorado Municipal System Eldorado Springs 308 Groundwater 0 0 0
East Boulder County WD Paragon Estates 300 Purchased surface water 0 0 0
Town of Jamestown Jamestown 280 Surface water 5 0 0
Lefthand WSD Lake Pines Altona 250 Purchased surface water 0 0 No inventory
Olde Stage WD Lazy Acres and land outside it 250 Groundwater 0 0 0
Town of Ward Ward 230 Groundwater 0 1 0
Sans Souci MHP Outside cities and towns 150 Groundwater under direct influence 13 2 0
Spring Valley Mutual WA Outside cities and towns 100 Groundwater 2 0 0
Lark Meadows WA Outside cities and towns 75 Groundwater 0 0 0
Table Mesa Village MHP Outside cities and towns 75 Groundwater under direct influence 11 0 0
Maple Grove WD Outside cities and towns 35 Groundwater 0 7 0

Systems placed by county record in Boulder County

13 systems

EPA has no service area map for some of these systems, and the maps it has for the others do not line up with their own records. They are placed by the county their records name (the counties EPA lists them serving, or the county coded in their IDs where EPA lists none), and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Longs Peak WD County on record 3,200 Surface water 0 0 0
Arbordale Acres MHP County on record 901 Purchased surface water 1 1 No inventory
Boulder Ridge MHP County on record 897 Purchased surface water 0 0 No inventory
Countryside of Longmont County on record 775 Purchased surface water 0 1 0
Vista Village MHP County on record 750 Purchased surface water 1 0 0
St Vrain MHP LLC County on record 544 Purchased surface water 0 0 0
Skylark Mobile Home Community County on record 342 Purchased surface water 0 0 No inventory
Grand Meadow of Longmont MHP County on record 255 Purchased surface water 0 1 0
Mountain View MHP County on record 211 Purchased surface water 0 0 No inventory
Lafayette Gardens County on record 207 Purchased surface water 0 0 0
Meadow Mtn Water Supply County on record 76 Surface water 0 0 0
LMP Coop MHP County on record 75 Purchased surface water 0 0 No inventory
Grace Mar WUA County on record 50 Groundwater 0 0 0

Cities and towns in Boulder County

18 places

Back to Colorado

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