Public water system · OR4100610
ActiveTierra Del Mar Water Co
At a glance
Tierra Del Mar Water Co (PWSID OR4100610) is an active community water system in Tillamook County, Oregon. It reports serving 80 people through 271 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in December 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
80
Service connections
271
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Tierra Del Mar Water Co compare with other water systems in Tillamook County?
By EPA's size categories, Tierra Del Mar Water Co is a very small system (500 people or fewer). Tillamook County has 63 active public water systems. Its population served is well below the county average of 538 people per system, and accounts for 0.2% of the 33,890 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active community water system reports serving 6,703 people, so Tierra Del Mar Water Co 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. Oregon has 940 active community water systems, 37% of the state's 2,536 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 211 Oregon systems (8.3%) list surface water as their primary source.
Who owns and regulates Tierra Del Mar Water Co?
EPA lists Tierra Del Mar Water Co as privately owned. The OR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 28 of the 63 active systems in Tillamook County (44%) are also privately owned.
Does Tierra Del Mar Water Co have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in December 2025. The violations listed here began between October 2024 and December 2025. By type: 7 monitoring and reporting, 3 monitoring and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Surface Water Treatment Rule (7 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 |
|---|---|---|---|---|
| 2025-12-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-12-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-12-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2025-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2025-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | 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.
Tierra Del Mar Water Co: frequently asked questions
Who runs Tierra Del Mar Water Co?
Tierra Del Mar Water Co (PWSID OR4100610) is a community water system privately owned. It is regulated by the OR state drinking water program.
How many people does Tierra Del Mar Water Co serve?
Tierra Del Mar Water Co reports serving 80 people through 271 service connections in Tillamook County, Oregon.
Where does Tierra Del Mar Water Co 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 Tierra Del Mar Water Co 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 December 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 Tierra Del Mar Water Co'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 December 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.
Where can I find Tierra Del Mar Water Co's water quality report?
As a community water system, Tierra Del Mar Water Co 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 Tillamook County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tillamook Water Dept, City of | Tillamook | 5,265 | Community | Surface water |
| Manzanita, City of | Tillamook | 3,200 | Community | Purchased groundwater |
| Oprd Cape Lookout State Park | Tillamook | 2,005 | Transient non-community | Surface water |
| Fairview Water District | Tillamook | 1,930 | Community | Groundwater |
| Netarts Water District | Tillamook | 1,800 | Community | Surface water |
| Neskowin Reg Water Dist | Tillamook | 1,735 | Community | Surface water |
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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, “Tierra Del Mar Water Co, PWSID OR4100610, Oregon”, https://aquacensus.com/water-systems/oregon/tierra-del-mar-water-co-or4100610 (data as of October 1, 2026).