County · South Dakota

Pennington County, South Dakota: drinking water records

Name: Drinking water records for Pennington County, South Dakota
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 67 community water systems across 9 ZIP codes in Pennington County, then find water-testing resources and available recent monitoring-station readings.

In focus67Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 5 of the 67 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 67 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Box Elder SD4600046	14,000	180	0	9	2 ppbbelow the action level
Rapid City SD4600406	72,009	600	1	0	6 ppbbelow the action level
Rapid Valley Sanitary District SD4600274	11,408	120	2	0	3 ppbbelow the action level
Ellsworth Afb SD4680004	9,100	120	0	0	1 ppbbelow the action level
Northdale Sanitary District SD4600514	1,075	0	0	1	2 ppbbelow the action level
Hill City SD4600159	872	0	0	2	1 ppbbelow the action level
Wall SD4600417	699	245	0	0	1 ppbbelow the action level
Prairie Acres LLC SD4600014	350	0	0	1	8 ppbbelow the action level
Prairie Acres North SD4600884	288	0	0	1	1 ppbbelow the action level
Happy Holiday RV Resort SD4600669	264	0	0	1	1 ppbbelow the action level
Sunnyside Mobile Home Park II SD4602001	235	0	0	2	1 ppbbelow the action level
Prairie Acres South SD4600428	170	0	0	1	1 ppbbelow the action level
Ponderosa Mobile Home Ranch SD4600260	150	0	0	1	4 ppbbelow the action level
Prairie Haven Subdivision SD4602322	105	0	0	3	1 ppbbelow the action level
Sheridan Lake Highlands, INC. SD4602285	85	0	0	4	7 ppbbelow the action level
Copper Oaks I SD4602136	64	0	0	1	1 ppbbelow the action level
Whispering Willows SD4602094	64	0	0	1	3 ppbbelow the action level
Owanka Rural Water System SD4602310	52	0	0	17	2 ppbbelow the action level
Lakeside Water Users District SD4602108	51	0	0	1	1 ppbbelow the action level
Cedar Gulch 1 SD4602301	45	0	0	3	1 ppbbelow the action level
Cedar Gulch 2 SD4602295	40	0	0	16	1 ppbbelow the action level
Highland Hills SD4600050	38	0	0	1	2 ppbbelow the action level
Happy Holiday Water Association SD4600420	35	0	0	1	1 ppbbelow the action level
Reynolds Court SD4600160	28	0	0	5	1 ppbbelow the action level
Hidden Valley Water Association INC SD4600269	27	0	0	1	2 ppbbelow the action level
Chapel Lane Water Company SD4600264	1,200	0	0	0	2 ppbbelow the action level
Colonial Pine Hills Sanitary Distric SD4600263	1,200	0	0	0	1 ppbbelow the action level
Wr/Lj - Creighton Project SD4602156	1,170	0	0	0	2 ppbbelow the action level
New Underwood SD4600224	679	0	0	0	1 ppbbelow the action level
Hisega Meadows Water INC SD4600271	491	0	0	0	1 ppbbelow the action level
Hart Ranch SD4600910	438	0	0	0	1 ppbbelow the action level
Pine Grove SD4600948	425	0	0	0	1 ppbbelow the action level
South Canyon Country Estates SD4600627	420	0	0	0	3 ppbbelow the action level
The Ranch at Black Gap SD4602203	375	0	0	0	1 ppbbelow the action level
Keystone SD4601082	349	0	0	0	2 ppbbelow the action level
Valley Heights Estates INC SD4602361	320	0	0	0	1 ppbbelow the action level
Carriage Hills SD4600265	267	0	0	0	2 ppbbelow the action level
Sunset Ranch SD4602263	263	0	0	0	1 ppbbelow the action level
Oaks Water Users Association SD4602135	180	0	0	0	2 ppbbelow the action level
Pine Cliff Estates SD4600270	180	0	0	0	5 ppbbelow the action level
Rapid City Mobile Home Park SD4600257	170	0	0	0	4 ppbbelow the action level
Strato Rim Estates Water Company SD4602191	170	0	0	0	1 ppbbelow the action level
Rushmore Ranch Estates SD4602212	168	0	0	0	1 ppbbelow the action level
Canyon Springs Water and Sewer Distr SD4602311	163	0	0	0	4 ppbbelow the action level
Westberry Trails Water Users Assoc SD4600253	155	0	0	0	2 ppbbelow the action level
B & J Mobile Home Park SD4602122	135	0	0	0	2 ppbbelow the action level
Country Road Estates SD4602204	112	0	0	0	2 ppbbelow the action level
Ponderosa Ridge SD4600863	98	0	0	0	1 ppbbelow the action level
Spring Canyon Water Company SD4600015	89	0	0	0	4 ppbbelow the action level
Wasta SD4600352	84	0	0	0	2 ppbbelow the action level
Edelweiss Mountain Improvement Assoc SD4600273	70	0	0	0	14 ppbbelow the action level
Thrall Mtn. Property Owners Associat SD4600513	70	0	0	0	2 ppbbelow the action level
Siphon Hill Water Association SD4600272	68	0	0	0	3 ppbbelow the action level
High Meadows Ranchettes SD4600011	60	0	0	0	2 ppbbelow the action level
Ponderosa Park SD4600405	50	0	0	0	1 ppbbelow the action level
Whispering Pines Water Association SD4600268	48	0	0	0	2 ppbbelow the action level
Golden Hills Homes SD4602213	47	0	0	0	2 ppbbelow the action level
Boxelder High Country Association SD4602276	45	0	0	0	5 ppbbelow the action level
Cavalry Trails Homeowner Association SD4602106	44	0	0	0	4 ppbbelow the action level
Bridle Ridge Estates SD4602362	38	0	0	0	1 ppbbelow the action level
High Sheridan Ranch SD4602234	38	0	0	0	1 ppbbelow the action level
Rimrock Heights Homeowners Associati SD4602356	35	0	0	0	4 ppbbelow the action level
Rimrock Ridge Water Association SD4602084	35	0	0	0	4 ppbbelow the action level
Norris Peak Water Users Assoc SD4602349	30	0	0	0	2 ppbbelow the action level
Darlington Estates SD4600403	25	0	0	5	not reported
Pineview Water Association SD4602153	25	0	0	0	1 ppbbelow the action level
Ponderosa Water Company SD4602134	25	0	0	0	2 ppbbelow the action level

USGS · Monitoring stations

The water, more recently.

Available station readings in Pennington County, South Dakota. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Pennington County

9ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Caputa
Hill City
Keystone
Quinn
Rapid City
Wall

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

57701Rapid City
57702Rapid City
57703Rapid City
57725Caputa
57745Hill City
57751Keystone
57775Quinn
57780
57790Wall

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 2 of the 5 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter3 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Pennington County

All South Dakota counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.