Public water system · WA5348720
ActiveLower Monumental Dam - North
At a glance
Lower Monumental Dam - North (PWSID WA5348720) is an active non-transient non-community water system in Franklin County, Washington. It reports serving 56 people through 2 service connections. 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 June 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
56
Service connections
2
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Lower Monumental Dam - North compare with other water systems in Franklin County?
By EPA's size categories, Lower Monumental Dam - North is a very small system (500 people or fewer). Franklin County has 80 active public water systems. Its population served is well below the county average of 1,644 people per system, and accounts for less than 0.1% of the 131,535 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Lower Monumental Dam - North is well 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. Washington has 400 active non-transient non-community water systems, 8.5% of the state's 4,705 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 4,370 Washington systems (93%) list groundwater as their primary source.
Who owns and regulates Lower Monumental Dam - North?
EPA lists Lower Monumental Dam - North as owned by the federal government. The WA 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 80 active systems in Franklin County (6.3%) are also owned by the federal government.
Does Lower Monumental Dam - North have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2011. The violations listed here began between January 2007 and June 2011. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). 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 |
|---|---|---|---|---|
| 2011-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlor epoxidecode 2067 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | 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.
Lower Monumental Dam - North: frequently asked questions
Who runs Lower Monumental Dam - North?
Lower Monumental Dam - North (PWSID WA5348720) is a non-transient non-community water system owned by the federal government. It is regulated by the WA state drinking water program.
How many people does Lower Monumental Dam - North serve?
Lower Monumental Dam - North reports serving 56 people through 2 service connections in Franklin County, Washington.
Where does Lower Monumental Dam - North 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 Lower Monumental Dam - North 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 June 2011. 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 Lower Monumental Dam - North'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 June 2011. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Lower Monumental Dam - North's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Lower Monumental Dam - North 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 Franklin County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Pasco Water Department | Franklin | 115,102 | Community | Surface water |
| Connell City of | Franklin | 5,150 | Community | Groundwater |
| Basin City Water Sewer District | Franklin | 1,740 | Community | Groundwater |
| Lamb-Weston Pasco | Franklin | 620 | Non-transient non-community | Groundwater |
| Pasco Port of 210 | Franklin | 500 | Non-transient non-community | Purchased surface water |
| Mesa Water Department | Franklin | 495 | 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, “Lower Monumental Dam - North, PWSID WA5348720, Washington”, https://aquacensus.com/water-systems/washington/lower-monumental-dam-north-wa5348720 (data as of October 1, 2026).