57028
Flandreau, SD
Moody County
BIG SIOUX COMMUNITY WATER SYSTEM

Is Flandreau tap water safe to drink?

Higher concern
Last tested: September 2024
Source: EPA UCMR5 utility monitoring plus EPA Water Quality Portal well sampling (mapped to nearest ZIP). Last tested September 2024.
CDP:
Townships:
  • Clare, SD
  • Grovena, SD
  • Riverview, SD
  • Spring Creek, SD
  • Union, SD
  • Lone Rock, SD
Neighborhood:
  • Flandreau

The short answer for Flandreau

Flandreau tap water has 3 contaminants above EPA guidelines, including lithium at 3.1× the limit (tested September 2024). See the full compound-by-compound breakdown and filter recommendations.

The health risk for Flandreau

lithium has been detected above EPA limits in this water system's recent tests. A certified filter designed for this contaminant type is strongly recommended.
  • lithium above limit.
lithium concentration (µg/L) September 2024
0 µg/L 10 µg/L 50 µg/L
31.000 µg/L
Detected
µg/L
10 µg/L
EPA limit
guideline
210% above limit
Comparison
vs. guideline
EPA limit: 10 µg/L | Your water: 31.000 µg/L
Certified Filters for Flandreau Tap Water

lithium was detected above EPA limits. These filters are independently certified to reduce common drinking-water contaminants.

Water filter recommendation for Flandreau tap water: Epic Pure XP Water Filter Pitcher
Pitcher filter
Epic Pure XP Water Filter Pitcher
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NSF/ANSI 42, 53, 401 & P473Removes 99.99% PFASMade in USABPA-free
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Most elevated compounds
Compound Measurement EPA Limit Comparison
lithium
Tested: September 2024 · Minnehaha RWS		 31.000 µg/L 10 µg/L 210% above limit
lithium
Tested: September 2024 · Egan Plant		 28.000 µg/L 10 µg/L 180% above limit
lithium
Tested: September 2024 · Brandt Plant		 14.000 µg/L 10 µg/L 40% above limit
View all tested compounds

Brandt Plant · Tested: September 2024

Compound Measurement EPA Limit Comparison
lithium 14.000 µg/L 10 µg/L 40% above limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFHxA <0.003 µg/L 3 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFBS <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFOA <0.004 µg/L 0.004 µg/L Below limit
PFOS <0.004 µg/L 0.004 µg/L Below limit
PFPeA <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Egan Plant · Tested: September 2024

Compound Measurement EPA Limit Comparison
lithium 28.000 µg/L 10 µg/L 180% above limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFHxA <0.003 µg/L 3 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFBS <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFOA <0.004 µg/L 0.004 µg/L Below limit
PFOS <0.004 µg/L 0.004 µg/L Below limit
PFPeA <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Minnehaha RWS · Tested: September 2024

Compound Measurement EPA Limit Comparison
lithium 31.000 µg/L 10 µg/L 210% above limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFHxA <0.003 µg/L 3 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFBS <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFOA <0.004 µg/L 0.004 µg/L Below limit
PFOS <0.004 µg/L 0.004 µg/L Below limit
PFPeA <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Monitoring Well B · Tested: Multiple dates

Compound Measurement EPA Limit Comparison
Nitrate 23.000 mg/L 1E+04 mg/L 0.2% of limit
Nitrate + Nitrite 0.860 mg/L 1E+04 mg/L 0.0% of limit
Nitrite 0.011 mg/L 1000 mg/L 0.0% of limit
2-Chloro-4,6-diamino-s-tria... 61.300 ng/L — —
Acetochlor ESA 43.400 ng/L — —
Acetochlor OA 478.000 ng/L — —
Aminopyralid 121.000 ng/L — —
Ammonia 0.055 mg/L — —
Bromide 0.042 mg/L — —
Calcium 120.000 mg/L — —
Chloride 28.600 mg/L — —
Iron 0.033 mg/L — —
Magnesium 24.000 mg/L — —
Metolachlor ESA 177.000 ng/L — —
Metolachlor OA 336.000 ng/L — —
Picloram 50.000 ng/L — —
Pyroxasulfone M1 18.600 ng/L — —
Sulfate 50.000 mg/L — —
Sulfentrazone 62.000 ng/L — —
Total dissolved solids 550.000 mg/L — —
Total hardness 450.000 mg/L — —
Total Kjeldahl nitrogen (Or... 0.720 mg/L — —
Total Nitrogen, mixed forms 23.700 mg/L — —
Total Phosphorus, mixed forms 0.074 mg/L — —
Total suspended solids 9.600 mg/L — —

Water utilities serving ZIP 57028

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline. Outlines appear when service-area boundary data is available for this ZIP.

Frequently Asked Questions about ZIP 57028 Tap Water

What contaminants are above EPA limits in ZIP 57028?

ZIP 57028 has 3 contaminants above EPA health guidelines in the latest available data, including lithium at 3.1x the EPA guideline. The full table on this page lists every tested compound and its measured level.

Will boiling ZIP 57028 tap water remove lithium?

No. Boiling tap water does not remove lithium. Lithium is a dissolved mineral, so heat does not break it down and evaporation can actually concentrate it. Reverse osmosis (NSF/ANSI 58) is the most reliable at-home option for reducing lithium.

Do basic pitcher filters remove lithium?

Standard pitcher filters are not certified to reduce lithium. Reverse osmosis (NSF/ANSI 58) is the most widely available home option for reducing lithium in drinking water.

Who provides tap water in ZIP 57028?

Public records identify BIG SIOUX COMMUNITY WATER SYSTEM as a primary water system associated with ZIP 57028. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 57028 tap water last tested?

The most recent test date used in this report is September 2024. EnviroClarity last refreshed this page on 2026-05-05.

Where can I find the official water quality report for ZIP 57028?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact BIG SIOUX COMMUNITY WATER SYSTEM or visit their website for the latest official report covering ZIP 57028. The EPA also maintains a national CCR locator.

Primary source EPA UCMR5 (2023-2025) + EPA WQP (well monitoring near ZIP)
Guideline source EPA drinking water standard (lithium: 10 µg/L)
Last tested September 2024
Last page update 2026-05-05

Check another ZIP code

    Nearby ZIP reports

    Data reflects publicly reported utility records from EPA datasets and local utility disclosures. This information is educational and not medical advice.

    Protect your water in Flandreau → see certified filters