Public water system · ND2901054

Active

Zap City of

At a glance

City of Zap (PWSID ND2901054) is an active community water system in Mercer County, North Dakota. It reports serving 237 people through 120 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2025.

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

Population served

237

Service connections

120

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDND2901054

System typeCommunity water system

Activity statusActive

Population served237

Service connections120

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyND state drinking water program

City servedZap

StateNorth Dakota

ZIP—

CountyMercer County

How does City of Zap compare with other water systems in Mercer County?

By EPA's size categories, City of Zap is a very small system (500 people or fewer). Mercer County has 10 active public water systems, and City of Zap is the 5th-largest of them by population served. Its population served is well below the county average of 1,070 people per system, and accounts for 2.2% of the 10,695 people reported by systems filed under the county. Across North Dakota, the 403 active systems average 1,864 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Zap 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. North Dakota has 317 active community water systems, 79% of the state's 403 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 83 North Dakota systems (21%) list purchased surface water as their primary source.

Who owns and regulates City of Zap?

EPA lists City of Zap as owned by a local government. The ND state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 10 of the 10 active systems in Mercer County (100%) are also owned by a local government.

Does City of Zap have drinking water violations?

EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2025. The violations listed here began between October 1980 and November 2025. By type: 5 monitoring and reporting, 3 contaminant level above the legal limit, 2 disinfectant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Chloramine (5 of them). EPA lists 6 as resolved and 5 as archived. 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. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2025-11-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Archived
2025-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chloraminecode 1006	No	Archived
2022-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chloraminecode 1006	No	Resolved
2018-07-01	Disinfectant level above the legal limitNon-Acute MRDL · code 11	Chloraminecode 1006	Yes	Resolved
2018-01-01	Disinfectant level above the legal limitNon-Acute MRDL · code 11	Chloraminecode 1006	Yes	Resolved
2014-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2014-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chloraminecode 1006	No	Resolved
2013-10-04	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2007-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1983-05-24	Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01	Fluoridecode 1025	Yes	Archived
1980-10-27	Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01	Fluoridecode 1025	Yes	Archived

All 11 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.

City of Zap: frequently asked questions

Who runs City of Zap?

City of Zap (PWSID ND2901054) is a community water system owned by a local government. It is regulated by the ND state drinking water program.

How many people does City of Zap serve?

City of Zap reports serving 237 people through 120 service connections in Mercer County, North Dakota.

Where does City of Zap get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does City of Zap have any drinking water violations?

EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 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 City of Zap'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 11 violations for this system; 5 are health-based, and the most recent began in November 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the ND state drinking water program.

Where can I find City of Zap's water quality report?

As a community water system, City of Zap 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 Mercer County

Water system	County	Population served	Type	Source
Omnd Water Treatment Plant	Mercer	4,168	Community	Surface water
Beulah City of	Mercer	3,058	Community	Groundwater
Hazen City of	Mercer	2,411	Community	Purchased surface water
Stanton City of	Mercer	366	Community	Purchased surface water
Golden Valley City of	Mercer	182	Community	Purchased surface water
Pick City City of	Mercer	123	Community	Purchased 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, “Zap City of, PWSID ND2901054, North Dakota”, https://aquacensus.com/water-systems/north-dakota/zap-city-of-nd2901054 (data as of October 1, 2026).