Public water system · ID3140066
ActiveLocust Subd
At a glance
Locust Subd (PWSID ID3140066) is an active community water system in Canyon County, Idaho. It reports serving 42 people through 15 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in September 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
42
Service connections
15
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Locust Subd compare with other water systems in Canyon County?
By EPA's size categories, Locust Subd is a very small system (500 people or fewer). Canyon County has 140 active public water systems. Its population served is well below the county average of 1,527 people per system, and accounts for less than 0.1% of the 213,824 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active community water system reports serving 6,703 people, so Locust Subd is well below 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. Idaho has 765 active community water systems, 39% of the state's 1,961 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,861 Idaho systems (95%) list groundwater as their primary source.
Who owns and regulates Locust Subd?
EPA lists Locust Subd as privately owned. The ID state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 123 of the 140 active systems in Canyon County (88%) are also privately owned.
Does Locust Subd have drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in September 2023. The violations listed here began between October 2009 and September 2023. By type: 4 public notice, recordkeeping or other, 4 monitoring and reporting, 3 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Groundwater Rule (5 of them). EPA lists 6 as resolved, 3 as unaddressed and 3 as archived. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-09-22 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2023-07-26 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2023-04-27 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Unaddressed |
| 2020-07-17 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2020-04-18 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 2016-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2010-12-03 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2010-07-29 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2009-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
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.
Locust Subd: frequently asked questions
Who runs Locust Subd?
Locust Subd (PWSID ID3140066) is a community water system privately owned. It is regulated by the ID state drinking water program.
How many people does Locust Subd serve?
Locust Subd reports serving 42 people through 15 service connections in Canyon County, Idaho.
Where does Locust Subd get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Locust Subd have any drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in September 2023. 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 Locust Subd'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, 4 are health-based, and the most recent began in September 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the ID state drinking water program.
Where can I find Locust Subd's water quality report?
As a community water system, Locust Subd 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 Canyon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Nampa City of | Canyon | 100,200 | Community | Groundwater |
| Caldwell City of | Canyon | 74,000 | Community | Groundwater |
| Middleton City of | Canyon | 13,190 | Community | Groundwater |
| Parma City of | Canyon | 2,250 | Community | Groundwater |
| Wilder City of | Canyon | 1,690 | Community | Groundwater |
| Caldwell Housing Authority | Canyon | 1,100 | Community | Groundwater |
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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, “Locust Subd, PWSID ID3140066, Idaho”, https://aquacensus.com/water-systems/idaho/locust-subd-id3140066 (data as of October 1, 2026).