Public water system · AZ0405608
ActiveUsfs-Cnf-Riggs Lake
At a glance
Usfs-Cnf-Riggs Lake (PWSID AZ0405608) is an active transient non-community water system in Graham County, Arizona. It reports serving 65 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
65
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Usfs-Cnf-Riggs Lake compare with other water systems in Graham County?
By EPA's size categories, Usfs-Cnf-Riggs Lake is a very small system (500 people or fewer). Graham County has 16 active public water systems. Its population served is well below the county average of 1,859 people per system, and accounts for 0.2% of the 29,739 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Usfs-Cnf-Riggs Lake is about half of that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Arizona has 601 active transient non-community water systems, 34% of the state's 1,769 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,612 Arizona systems (91%) list groundwater as their primary source.
Who owns and regulates Usfs-Cnf-Riggs Lake?
EPA lists Usfs-Cnf-Riggs Lake as owned by the federal government. The AZ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 5 of the 16 active systems in Graham County (31%) are also owned by the federal government.
Does Usfs-Cnf-Riggs Lake have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2021. The violations listed here began between October 1987 and August 2021. By type: 10 monitoring and reporting and 2 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 7 as archived and 5 as resolved. 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. 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 |
|---|---|---|---|---|
| 2021-08-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-07-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2002-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1987-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | 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.
Usfs-Cnf-Riggs Lake: frequently asked questions
Who runs Usfs-Cnf-Riggs Lake?
Usfs-Cnf-Riggs Lake (PWSID AZ0405608) is a transient non-community water system owned by the federal government. It is regulated by the AZ state drinking water program.
How many people does Usfs-Cnf-Riggs Lake serve?
Usfs-Cnf-Riggs Lake reports serving 65 people through 1 service connection in Graham County, Arizona.
Where does Usfs-Cnf-Riggs Lake 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 Usfs-Cnf-Riggs Lake 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 August 2021. 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 Usfs-Cnf-Riggs Lake'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 August 2021. For current results, consult EPA ECHO, or the AZ state drinking water program.
Where can I find Usfs-Cnf-Riggs Lake's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Usfs-Cnf-Riggs Lake is a 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 Graham County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Safford City of | Graham | 20,600 | Community | Groundwater |
| Graham County Utilities - Pima | Graham | 3,799 | Community | Groundwater |
| Freeport Mcmoran Safford | Graham | 1,619 | Non-transient non-community | Groundwater |
| Usdj Fbp Fed Corr Inst Safford | Graham | 949 | Community | Groundwater |
| Adoc Aspc Fort Grant | Graham | 800 | Community | Groundwater |
| Graham County Utilities-Fort Thomas | Graham | 452 | 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, “Usfs-Cnf-Riggs Lake, PWSID AZ0405608, Arizona”, https://aquacensus.com/water-systems/arizona/usfs-cnf-riggs-lake-az0405608 (data as of October 1, 2026).