Public water system · SD4602207

Active

Black Hawk Oil Company

At a glance

Black Hawk Oil Company (PWSID SD4602207) is an active transient non-community water system in Custer County, South Dakota. It reports serving 500 people through 1 service connection. 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 February 2013.

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

Population served

500

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDSD4602207

System typeTransient non-community water system

Activity statusActive

Population served500

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencySD state drinking water program

City servedBlack Hawk

StateSouth Dakota

ZIP57718

CountyCuster County

How does Black Hawk Oil Company compare with other water systems in Custer County?

By EPA's size categories, Black Hawk Oil Company is a very small system (500 people or fewer). Custer County has 49 active public water systems. Its population served is about 83% above the county average of 274 people per system, and accounts for 3.7% of the 13,414 people reported by systems filed under the county. Across South Dakota, the 699 active systems average 1,387 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Black Hawk Oil Company is about 3.5 times 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. South Dakota has 173 active transient non-community water systems, 25% of the state's 699 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 431 South Dakota systems (62%) list groundwater as their primary source.

Who owns and regulates Black Hawk Oil Company?

EPA lists Black Hawk Oil Company as privately owned. The SD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 27 of the 49 active systems in Custer County (55%) are also privately owned.

Does Black Hawk Oil Company have drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in February 2013. The violations listed here began between July 2001 and February 2013. By type: 4 public notice, recordkeeping or other, 3 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 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
2013-02-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2010-12-05	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2009-11-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2009-10-04	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2009-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2002-03-11	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2002-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2002-01-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-07-11	Public notice, recordkeeping or otherSanitary Survey (TCR) · code 28	Not reported	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.

Black Hawk Oil Company: frequently asked questions

Who runs Black Hawk Oil Company?

Black Hawk Oil Company (PWSID SD4602207) is a transient non-community water system privately owned. It is regulated by the SD state drinking water program.

How many people does Black Hawk Oil Company serve?

Black Hawk Oil Company reports serving 500 people through 1 service connection in Custer County, South Dakota.

Where does Black Hawk Oil Company 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 Black Hawk Oil Company have any drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in February 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 Black Hawk Oil Company'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 February 2013. For current results, consult EPA ECHO, or the SD state drinking water program.

Where can I find Black Hawk Oil Company's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Black Hawk Oil Company 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 Custer County

Water system	County	Population served	Type	Source
Laughing Water Restaurant at Crazy H	Custer	2,055	Non-transient non-community	Groundwater
Custer	Custer	1,919	Community	Groundwater
Nps-Wind Cave National Park	Custer	1,404	Non-transient non-community	Groundwater
Southern Black Hills Water	Custer + 1 more	947	Community	Groundwater
Csp-Sylvan Lake	Custer	799	Transient non-community	Groundwater
Csp-Game Lodge	Custer	541	Transient non-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, “Black Hawk Oil Company, PWSID SD4602207, South Dakota”, https://aquacensus.com/water-systems/south-dakota/black-hawk-oil-company-sd4602207 (data as of October 1, 2026).