Public water system · CO0107471
ActiveLeft Hand Wd
At a glance
Left Hand Wd (PWSID CO0107471) is an active community water system in Boulder County, Colorado. It reports serving 20,280 people through 7,769 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
20,280
Service connections
7,769
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Left Hand Wd compare with other water systems in Boulder County?
By EPA's size categories, Left Hand Wd is a large system (10,001 to 100,000 people). Boulder County has 81 active public water systems, and Left Hand Wd is the 6th-largest of them by population served. Its population served is about 3.8 times the county average of 5,397 people per system, and accounts for 4.6% of the 437,116 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active community water system reports serving 6,703 people, so Left Hand Wd is about 3 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Colorado has 1,068 active community water systems, 48% of the state's 2,207 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 228 Colorado systems (10%) list surface water as their primary source.
Who owns and regulates Left Hand Wd?
EPA lists Left Hand Wd as owned by a local government. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 22 of the 81 active systems in Boulder County (27%) are also owned by a local government.
Does Left Hand Wd have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2017. The violations listed here began between January 2005 and November 2017. By type: 12 monitoring and reporting. The contaminants or rules involved are Cryptosporidium, Turbidity, E. coli and Haloacetic acids (HAA5). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2017-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Cryptosporidiumcode 3015 | No | Resolved |
| 2017-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Turbiditycode 0100 | No | Resolved |
| 2017-11-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 2015-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Oxamylcode 2036 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Left Hand Wd: frequently asked questions
Who runs Left Hand Wd?
Left Hand Wd (PWSID CO0107471) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Left Hand Wd serve?
Left Hand Wd reports serving 20,280 people through 7,769 service connections in Boulder County, Colorado.
Where does Left Hand Wd get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Left Hand Wd have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2017. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Left Hand Wd's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Left Hand Wd's water quality report?
As a community water system, Left Hand Wd must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Boulder County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Boulder City of | Boulder | 166,080 | Community | Surface water |
| Longmont City of | Boulder | 104,178 | Community | Surface water |
| Erie Town of | Boulder | 47,444 | Community | Surface water |
| Lafayette City of | Boulder | 28,700 | Community | Surface water |
| Louisville City of | Boulder | 20,975 | Community | Surface water |
| Superior Md No 1 | Boulder | 17,900 | Community | Surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Left Hand Wd, PWSID CO0107471, Colorado”, https://aquacensus.com/water-systems/colorado/left-hand-wd-co0107471 (data as of October 1, 2026).