Records currently available
South Dakota record snapshot
These counts describe reviewed records available on Water Quality Lookup. They are not a count of every provider, city, or county in South Dakota.
Reviewed profiles or limited identity records.
Local entry points, not service-area boundaries.
Guide sources reviewed September 13, 2026.
Cities
South Dakota city entry points currently available
These South Dakota city pages are local starting points. City boundaries and water service areas may not match, and more than one provider may serve a city.
Sioux Falls
Start with SIOUX FALLS, then confirm the provider for your address.
Open Sioux FallsRapid City
Start with RAPID CITY, then confirm the provider for your address.
Open Rapid CitySpearfish
Start with SPEARFISH, then confirm the provider for your address.
Open SpearfishWater systems
South Dakota public water systems currently available
These previews link to reviewed system profiles with identifiers, report-year context, sources, and limitations.
SIOUX FALLS
PWSID SD4600294 · Sioux Falls · Latest reviewed report 2025
View system profileRAPID CITY
PWSID SD4600406 · Rapid City · Latest reviewed report 2025
View system profileSPEARFISH
PWSID SD4600311 · Spearfish · Latest reviewed report 2025
View system profileReport context
Three South Dakota systems and 2025 reports
These existing public system profiles were reviewed July 21, 2026. Their report material retains its original July 19, 2026 review date and source-printed sample periods.
Sioux Falls · SD4600294
Surface water and a separate purchased supply
The state-hosted Sioux Falls report describes surface-water sources and water purchased from Lewis and Clark Regional Water System. Its report tables identify the purchased supply separately. These are descriptions of the cited report period, not the source mix at a home today.
Rapid City · SD4600406
Local wells influenced by surface water
Rapid City’s report describes groundwater produced from local wells and says it is considered under the influence of surface water. That qualification matters when reading the source description; a simple “well water” label would leave it out.
Spearfish · SD4600311
A public system supplied by local wells
Spearfish’s report describes groundwater from local wells. Its utility monitoring belongs to that public system. It does not describe an individually owned well or establish the provider for every Spearfish address.
Continue your South Dakota lookup
Use the system directory, a plain-language guide, or the methodology page for the next step.
System directory
South Dakota public water systems
Browse the reviewed system profiles currently available for this state.
Browse systemsLookup guide
How to look up your drinking water system
Start with a utility bill, PWSID, state lookup tool, or official report so you can find the public water system behind a city or provider name.
Read the lookup guideReport guide
How to read a water quality report
A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.
Read the report guideData and trust
Sources, methodology, and limitations
See how records are sourced, reviewed, dated, and limited before using a summary.
Review methodologyStatewide context
Keep system identity, sources, and sample dates together
System identifiers
Match the full ID with the report’s shorter label
The selected records are Sioux Falls SD4600294, Rapid City SD4600406, and Spearfish SD4600311. Their state-hosted reports use shorter EPA ID labels such as 0294 for Sioux Falls. Keep the full PWSID and system name together when comparing sources.
A map point, city name, or nearby plant does not establish service to a property. Use your bill, landlord, or provider to confirm which system supplies you.
Purchased water
Check which system a table row describes
Sioux Falls’ report names Lewis and Clark Regional Water System as a purchased-water source and uses an asterisk to distinguish that system’s rows. Read the table note before comparing two rows for the same substance. The two systems remain separate regulatory records.
Assessment context
A source assessment answers a different question
The three reports include source-water susceptibility assessments. Those assessments concern potential contamination of a source; they are not household test results or a current advisory determination. Use the dated monitoring tables and current provider instructions for those separate questions.
Official lookup
Use South Dakota’s map alongside the exact system record
DANR map
Search by name, then confirm the system ID
DANR’s Drinking Water Program embeds a Public Water Systems map. A search for Sioux Falls returned one Sioux Falls option and selected a point at the City of Sioux Falls Water Purification facility. That tested map view did not display a PWSID. EPA’s separate identity record matches Sioux Falls to SD4600294.
- Open the public systems map and search the supplier name from your bill or report.
- Compare the selected name with the full PWSID on the report or EPA record.
- Confirm service with the provider; the selected map point is a facility location.
Annual reports
Read the year and table notes inside the PDF
DANR hosts the three utility reports linked here and explains how consumer confidence reports are delivered. A report’s filename may not contain its reporting year. Check the document’s system name, table year, sample dates, and purchased-water notes.
If the report is missing or difficult to use, ask the provider for the correct system’s report, a paper or accessible copy, or language assistance.
Read DANR’s annual-report guidance →
Open Sioux Falls’ official report →
Official guidance
Choose the resource for your question
Current instructions
Ask the provider about notices that apply now
DANR’s public-notification page explains notification requirements and provides resources for water systems. It is not a list confirming today’s advisory status for your address. Check the provider’s current notice and its affected area; ask how to receive future customer alerts.
Service-line materials
Use the inventory as a starting point
DANR’s lead-service-line page presents a statewide inventory dashboard and customer/provider resources. Ask your utility to confirm the record for your service line, the material on each ownership side, and how to correct an unknown or outdated entry. An inventory category is not a tap-water test result.
Private wells
Arrange testing for the well you use
DANR’s private-well page explains sampling and links a private-well assessment resource. A nearby city’s annual report does not test your well. Contact the program or a laboratory about your well and the analyses you need before collecting a sample.
Laboratory selection
Match the laboratory to the analysis
DANR lists laboratories and the drinking-water analyses for which they are certified. Certification categories vary. Ask whether the laboratory accepts residential samples, whether it performs the requested analysis, and what containers, collection instructions, and delivery timing it requires.
PFAS resources
Keep the sample and reporting period in view
DANR’s PFAS page provides drinking-water information and links federal resources. For a specific result, ask for the system or well identity, sampling location, collection date, units, and laboratory qualifiers. The program page alone does not establish a result for your water supply or home.
Common questions
Reading South Dakota water information
Report notes
Why does Sioux Falls list some substances twice?
The report distinguishes some Lewis and Clark purchased-water rows with an asterisk. The note identifies a different system’s results. Compare the system, sample date, units, and row notes before treating the entries as one measurement.
Sample dates
Does a 2025 report mean every sample was collected in 2025?
No. Annual reports can carry forward samples from earlier monitoring periods. Read the date printed beside each result. The original dates in our reviewed system overviews remain attached to those results.
Map interpretation
Does the public systems map identify my provider?
The tested Sioux Falls search selected a treatment-facility point. That is useful for orientation, but it did not establish a service boundary or match an address. Confirm your supplier from your bill, landlord, or the provider.
Official sources
Official sources for South Dakota
Use South Dakota Department of Agriculture and Natural Resources and the official sources below to verify system identity, record dates, and current notices before relying on a summary.
Statewide sources
South Dakota Department of Agriculture and Natural Resources
PWSID SD4600294 · Sources for this system
City of Sioux Falls 2025 Drinking Water Report
Utility report
PWSID SD4600406 · Sources for this system
City of Rapid City 2025 Drinking Water Report
Utility report
PWSID SD4600311 · Sources for this system
City of Spearfish 2025 Drinking Water Report
Utility report