Public water system · SD4600527

Active

Larsson'S Crooked Creek Cg-North Wel

At a glance

Larsson'S Crooked Creek Cg-North Wel (PWSID SD4600527) is an active transient non-community water system in Pennington County, South Dakota. It reports serving 124 people through 75 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2023.

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

Population served

124

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDSD4600527

System typeTransient non-community water system

Activity statusActive

Population served124

Service connections75

Primary water sourceGroundwater

Owner typePrivate

Primacy agencySD state drinking water program

City servedBlack Hawk

StateSouth Dakota

ZIP57718

CountyPennington County

How does Larsson'S Crooked Creek Cg-North Wel compare with other water systems in Pennington County?

By EPA's size categories, Larsson'S Crooked Creek Cg-North Wel is a very small system (500 people or fewer). Pennington County has 150 active public water systems. Its population served is well below the county average of 930 people per system, and accounts for less than 0.1% of the 139,467 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 Larsson'S Crooked Creek Cg-North Wel is about 14% 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. 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 Larsson'S Crooked Creek Cg-North Wel?

EPA lists Larsson'S Crooked Creek Cg-North Wel 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. 134 of the 150 active systems in Pennington County (89%) are also privately owned.

Does Larsson'S Crooked Creek Cg-North Wel have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2023. The violations listed here began between January 2008 and June 2023. By type: 5 contaminant level above the legal limit, 3 public notice, recordkeeping or other, 2 monitoring and reporting, 1 monitoring and 1 required treatment not met. The contaminant or rule involved most often is Nitrate (6 of them). EPA lists 11 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2023-06-05	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2019-11-13	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-10-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-08-11	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2017-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2011-10-28	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2011-01-01	Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04	Nitratecode 1040	No	Resolved
2011-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01	Nitratecode 1040	Yes	Resolved
2010-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2009-09-07	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2009-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2008-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	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.

Larsson'S Crooked Creek Cg-North Wel: frequently asked questions

Who runs Larsson'S Crooked Creek Cg-North Wel?

Larsson'S Crooked Creek Cg-North Wel (PWSID SD4600527) is a transient non-community water system privately owned. It is regulated by the SD state drinking water program.

How many people does Larsson'S Crooked Creek Cg-North Wel serve?

Larsson'S Crooked Creek Cg-North Wel reports serving 124 people through 75 service connections in Pennington County, South Dakota.

Where does Larsson'S Crooked Creek Cg-North Wel 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 Larsson'S Crooked Creek Cg-North Wel have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2023. 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 Larsson'S Crooked Creek Cg-North Wel'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, 6 are health-based, and the most recent began in June 2023. For current results, consult EPA ECHO, or the SD state drinking water program.

Where can I find Larsson'S Crooked Creek Cg-North Wel's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Larsson'S Crooked Creek Cg-North Wel 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 Pennington County

Water system	County	Population served	Type	Source
Rapid City	Pennington	72,009	Community	Surface water
Box Elder	Pennington	14,000	Community	Groundwater
Rapid Valley Sanitary District	Pennington	11,408	Community	Surface water
Ellsworth Afb	Pennington	9,100	Community	Purchased surface water
Nps-Mount Rushmore National Memorial	Pennington	4,100	Non-transient non-community	Groundwater
Colonial Pine Hills Sanitary Distric	Pennington	1,200	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, “Larsson'S Crooked Creek Cg-North Wel, PWSID SD4600527, South Dakota”, https://aquacensus.com/water-systems/south-dakota/larsson-s-crooked-creek-cg-north-wel-sd4600527 (data as of October 1, 2026).