Public water system · IA5285207

Active

Tdccoa

At a glance

Tdccoa (PWSID IA5285207) is an active transient non-community water system in Johnson County, Iowa. It reports serving 25 people through 10 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 2013.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDIA5285207

System typeTransient non-community water system

Activity statusActive

Population served25

Service connections10

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyIA state drinking water program

City servedSwisher

StateIowa

ZIP—

CountyJohnson County

How does Tdccoa compare with other water systems in Johnson County?

By EPA's size categories, Tdccoa is a very small system (500 people or fewer). Johnson County has 125 active public water systems. Its population served is well below the county average of 1,384 people per system, and accounts for less than 0.1% of the 172,955 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Tdccoa is well 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. Iowa has 626 active transient non-community water systems, 34% of the state's 1,828 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.

Who owns and regulates Tdccoa?

EPA lists Tdccoa as privately owned. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 102 of the 125 active systems in Johnson County (82%) are also privately owned.

Does Tdccoa have drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 2013. The violations listed here began between July 2008 and October 2013. By type: 7 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 9 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
2013-10-06	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2013-09-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2013-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2013-09-01	Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25	Total coliform bacteria (TCR)code 3100	No	Resolved
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2012-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2012-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2009-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-07-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved

All 9 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.

Tdccoa: frequently asked questions

Who runs Tdccoa?

Tdccoa (PWSID IA5285207) is a transient non-community water system privately owned. It is regulated by the IA state drinking water program.

How many people does Tdccoa serve?

Tdccoa reports serving 25 people through 10 service connections in Johnson County, Iowa.

Where does Tdccoa 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 Tdccoa have any drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 2013. 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 Tdccoa'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 9 violations for this system; 2 are health-based, and the most recent began in October 2013. For current results, consult EPA ECHO, or the IA state drinking water program.

Where can I find Tdccoa's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Tdccoa 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 Johnson County

Water system	County	Population served	Type	Source
Iowa City Water Department	Johnson	68,753	Community	Surface water
University Water System	Johnson	26,684	Community	Surface water
North Liberty Water Supply	Johnson	23,276	Community	Groundwater
Coralville Muni Water System	Johnson	22,318	Community	Groundwater
Tiffin Water Supply	Johnson	7,577	Community	Groundwater
Solon Water Dept	Johnson	3,018	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, “Tdccoa, PWSID IA5285207, Iowa”, https://aquacensus.com/water-systems/iowa/tdccoa-ia5285207 (data as of October 1, 2026).