What was found in ZIP 57783
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 299 µg/L 3% of the EPA limit 10000 µg/L Main supplier: SPEARFISH · 13,803 people · 2019
Highest in the ZIP: 2080 µg/L — BICENTENNIAL TRAILER COURT · 23 people · 2019 | 16/28 | SYR4 |
| Barium | 191.3 µg/L 9.6% of the EPA limit 2000 µg/L Main supplier: SPEARFISH · 13,803 people · 2018
Highest in the ZIP: 588.85 µg/L — MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC · 268 people · 2013 | 20/28 | SYR4 |
| Fluoride | 500 µg/L 13% of the EPA limit 4000 µg/L Main supplier: SPEARFISH · 13,803 people · 2012 | 21/28 | SYR4 |
| Copper | 231 µg/L 18% of the EPA limit 1300 µg/L Main supplier: SPEARFISH · 13,803 people · 2018
Highest in the ZIP: 459.9 µg/L — SAINT ONGE SEWER & WATER CO · 255 people · 2018 | 24/28 | SYR4 |
| Nitrite | 127 µg/L 13% of the EPA limit 1000 µg/L Highest in the ZIP: SUNRISE HOMEOWNERS ASSOCIATION · 50 people · 2018 | 1/28 | SYR4 |
| Lead | 6 µg/L 40% of the EPA limit 15 µg/L Main supplier: SPEARFISH · 13,803 people · 2018
Highest in the ZIP: 15.2 µg/L — KEN'S TRAILER COURT · 110 people · 2018 | 24/28 | SYR4 |
| TTHM | 6.72 µg/L 8.4% of the EPA limit 80 µg/L Main supplier: SPEARFISH · 13,803 people · 2019
Highest in the ZIP: 12.794 µg/L — WESTVIEW HOMEOWNERS ASSOCIATION · 103 people · 2019 | 8/28 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.15 pCi/L 41% of the EPA limit 15 pCi/L Main supplier: SPEARFISH · 13,803 people · 2015
Highest in the ZIP: 10.2 pCi/L — COUNTRY ROAD ESTATES · 112 people · 2019 | 17/28 | SYR4 |
| Selenium | 9 µg/L 18% of the EPA limit 50 µg/L Highest in the ZIP: COUNTRY ROAD ESTATES · 112 people · 2013 | 5/28 | SYR4 |
| Arsenic | 5 µg/L 50% of the EPA limit 10 µg/L Main supplier: SPEARFISH · 13,803 people · 2018
Highest in the ZIP: 6 µg/L — CENTENNIAL VISTA ESTATES · 44 people · 2018 | 5/28 | SYR4 |
| Chromium | 3 µg/L 3% of the EPA limit 100 µg/L Main supplier: SPEARFISH · 13,803 people · 2018
Highest in the ZIP: 5.6 µg/L — CENTENNIAL HILLS HOME ASSOCIATION · 25 people · 2013 | 3/28 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.9265 µg/L 1.5% of the EPA limit 60 µg/L Main supplier: SPEARFISH · 13,803 people · 2019
Highest in the ZIP: 1.5 µg/L — SAINT ONGE SEWER & WATER CO · 255 people · 2018 | 2/28 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: SPEARFISH · 13,803 people · 2024
Highest in the ZIP: 0.0050 mg/L — KEN'S TRAILER COURT · 110 people · 2024 | 27/28 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
Water suppliers serving ZIP 57783
| Supplier | State | Population served |
|---|---|---|
| SPEARFISH | SD | 13,803 |
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | SD | 268 |
| SAINT ONGE SEWER & WATER CO | SD | 255 |
| LANTERN ESTATES | SD | 192 |
| WALNUT PARK | SD | 180 |
| SPEARFISH VALLEY MOBILE ESTATES | SD | 163 |
| COUNTRY ROAD ESTATES | SD | 112 |
| KEN'S TRAILER COURT | SD | 110 |
| WESTFIELD ADDITION | SD | 104 |
| WESTVIEW HOMEOWNERS ASSOCIATION | SD | 103 |
| D & E WATER COMPANY | SD | 100 |
| SPEARFISH MEADOWS | SD | 87 |
| LOURIE LANE HOMEOWNERS ASSOC | SD | 75 |
| RIVERSIDE MOBILE HOME COURT | SD | 75 |
| WILD TURKEY ESTATES II | SD | 70 |
| SPRING CREEK PRESERVE | SD | 68 |
| MEADOW CREST SANITARY DISTRICT | SD | 63 |
| DEBERG WELL USERS ASSOCIATION | SD | 54 |
| SUNRISE HOMEOWNERS ASSOCIATION | SD | 50 |
| CENTENNIAL VISTA ESTATES | SD | 44 |
| VALLEY VIEW WATER ASSOCIATION | SD | 42 |
| WILD TURKEY ESTATES I | SD | 33 |
| THE TIMBERS | SD | 33 |
| TWO BIT RANCH ESTATES | SD | 30 |
| REYNOLDS COURT | SD | 28 |
| CHRIS' MOBILE HOME COURT | SD | 25 |
| CENTENNIAL HILLS HOME ASSOCIATION | SD | 25 |
| BICENTENNIAL TRAILER COURT | SD | 23 |
Frequently asked questions about ZIP 57783 tap water
Is the tap water in ZIP 57783 safe to drink?
EPA testing detected 13 contaminants across the water suppliers serving ZIP 57783. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 57783?
28 public water suppliers report EPA drinking-water monitoring for ZIP 57783. Each is listed above with its population served.
What contaminants are in ZIP 57783's water?
EPA monitoring detected Nitrate, Barium, Fluoride, Copper, Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.