Public water system · CA5410515
ActiveNps-Atwell Mill
At a glance
Nps-Atwell Mill (PWSID CA5410515) is an active transient non-community water system in Tulare County, California. It reports serving 80 people through 9 service connections. Its primary water source is surface water, and EPA lists it as owned by the federal government. EPA's records list 6 violations for this system; 5 are health-based, and the most recent began in January 2000.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
80
Service connections
9
Primary source
SW
Surface water
System type
TNCWS
Transient non-community water system
System record
How does Nps-Atwell Mill compare with other water systems in Tulare County?
By EPA's size categories, Nps-Atwell Mill is a very small system (500 people or fewer). Tulare County has 274 active public water systems. Its population served is well below the county average of 1,700 people per system, and accounts for less than 0.1% of the 465,710 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Nps-Atwell Mill is about 44% below 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. California has 3,016 active transient non-community water systems, 40% of the state's 7,479 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Nps-Atwell Mill?
EPA lists Nps-Atwell Mill as owned by the federal government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 18 of the 274 active systems in Tulare County (6.6%) are also owned by the federal government.
Does Nps-Atwell Mill have drinking water violations?
EPA's records list 6 violations for this system; 5 are health-based, and the most recent began in January 2000. The violations listed here began between July 1994 and January 2000. By type: 5 required treatment not met and 1 monitoring and reporting. The contaminant or rule involved most often is Surface Water Treatment Rule (5 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1998-07-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1998-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1994-09-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1994-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1994-07-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 6 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.
Nps-Atwell Mill: frequently asked questions
Who runs Nps-Atwell Mill?
Nps-Atwell Mill (PWSID CA5410515) is a transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Nps-Atwell Mill serve?
Nps-Atwell Mill reports serving 80 people through 9 service connections in Tulare County, California.
Where does Nps-Atwell Mill 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 Nps-Atwell Mill have any drinking water violations?
EPA's records list 6 violations for this system; 5 are health-based, and the most recent began in January 2000. 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 Nps-Atwell Mill'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. EPA's records list 6 violations for this system; 5 are health-based, and the most recent began in January 2000. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Nps-Atwell Mill's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Nps-Atwell Mill 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 Tulare County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cws - Visalia | Tulare | 148,496 | Community | Groundwater |
| Tulare, City of | Tulare | 72,241 | Community | Groundwater |
| Porterville, City of | Tulare | 63,487 | Community | Groundwater |
| Dinuba, City of | Tulare | 27,281 | Community | Groundwater |
| Lindsay, City of | Tulare | 12,659 | Community | Surface water |
| Exeter, City of | Tulare | 11,169 | 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, “Nps-Atwell Mill, PWSID CA5410515, California”, https://aquacensus.com/water-systems/california/nps-atwell-mill-ca5410515 (data as of October 1, 2026).