Is Spearfish, SD Tap Water Safe to Drink?
Spearfish, SD tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.
Where Does Spearfish Get Its Water?
Water in Spearfish, SD is provided by 1 public water system: SPEARFISH.
How Is Spearfish Tap Water Treated?
Treated water is disinfected using chloramines. Treatment includes groundwater disinfection.
What's in Spearfish Tap Water?
The following contaminants were detected most frequently in Spearfish public water systems. All detected levels fall at or below EPA health guidelines in this dataset.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 9 µg/L | — | 0 ZIPs | Within guideline |
| PFTrDA | 0.007 µg/L | 0.007 µg/L | 1 ZIP | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 6:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Spearfish
Current EPA monitoring data for Spearfish shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.
Best Filters for PFAS Water Profile
PFAS compounds are detected in this water supply. A reverse osmosis (RO) system or an activated-carbon filter specifically certified under NSF/ANSI P473 is required for reliable PFAS reduction. Standard pitcher and faucet filters without P473 certification do not remove PFAS.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Spearfish Tap Water
Is Spearfish tap water safe to drink?
Spearfish tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.
What contaminants are in Spearfish tap water?
The most commonly detected contaminants in Spearfish water systems include: lithium, PFTrDA, PFBA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Spearfish get its drinking water?
Spearfish receives water from one public water system, including SPEARFISH.
Do I need a water filter in Spearfish?
Current data does not show guideline exceedances in Spearfish. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.
How often is Spearfish tap water tested?
Public water systems in Spearfish are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-09-09.
Tap water reports by ZIP in Spearfish
- 57783 - Spearfish tap water report Some concern
Water utilities serving Spearfish, SD
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- SPEARFISHSome concern
- SAINT ONGE SEWER & WATER CONo recent federal sampling
Also covers / overlaps with
- Mountain Plains, SD · CDP
- North Lawrence UT, SD · Township
- North Spearfish, SD · CDP
- South Lawrence UT, SD · Township