Public water system · CO0212800
ActiveSierra Grande School District
At a glance
Sierra Grande School District (PWSID CO0212800) is an active non-transient non-community water system in Costilla County, Colorado. It reports serving 304 people through 10 service connections. Its primary water source is groundwater, 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 January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
304
Service connections
10
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Sierra Grande School District compare with other water systems in Costilla County?
By EPA's size categories, Sierra Grande School District is a very small system (500 people or fewer). Costilla County has 12 active public water systems, and Sierra Grande School District is the 5th-largest of them by population served. Its population served is about 27% above the county average of 239 people per system, and accounts for 11% of the 2,872 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Sierra Grande School District is about 29% below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Colorado has 183 active non-transient non-community water systems, 8.3% of the state's 2,207 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,437 Colorado systems (65%) list groundwater as their primary source.
Who owns and regulates Sierra Grande School District?
EPA lists Sierra Grande School District 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. 7 of the 12 active systems in Costilla County (58%) are also owned by a local government.
Does Sierra Grande School District have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025. The violations listed here began between January 2023 and January 2025. By type: 10 monitoring and reporting and 2 public notice, recordkeeping or other. The contaminants or rules involved are Lead and Copper Rule, Public Notice, Revised Total Coliform Rule and Diquat. 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-04-28 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2023-03-28 | Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dalaponcode 2031 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endothallcode 2033 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | 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.
Sierra Grande School District: frequently asked questions
Who runs Sierra Grande School District?
Sierra Grande School District (PWSID CO0212800) is a non-transient non-community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Sierra Grande School District serve?
Sierra Grande School District reports serving 304 people through 10 service connections in Costilla County, Colorado.
Where does Sierra Grande School District 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 Sierra Grande School District 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 January 2025. 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 Sierra Grande School District'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 January 2025. For current results, consult EPA ECHO, or the CO state drinking water program.
Where can I find Sierra Grande School District's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Sierra Grande School District is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Costilla County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| San Luis Wsd | Costilla | 629 | Community | Groundwater |
| Costilla County Ws | Costilla | 561 | Community | Groundwater |
| Ft Garland Wsd | Costilla | 477 | Community | Groundwater |
| Blanca Town of | Costilla | 469 | Community | Groundwater |
| Blanca Ft Garland Md | Costilla | 108 | Transient non-community | Groundwater |
| Garcia Domestic Wua | Costilla | 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, “Sierra Grande School District, PWSID CO0212800, Colorado”, https://aquacensus.com/water-systems/colorado/sierra-grande-school-district-co0212800 (data as of October 1, 2026).