01The verdict: is Piedmont water safe?
Piedmont's drinking water has significant quality concerns based on EPA testing data. With a grade of F (39.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 27 water systems serve approximately 5,059 residents using groundwater (wells).
Copper is over its legal limit
Measured at 4.00 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓5K people, 27 systems
All figures on this page come from federal EPA compliance and testing data for the systems serving this city.
See the systems ↓13 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Piedmont's drinking water received a grade of F (39.5 out of 100), indicating failing water quality. The city's 27 water systems serve approximately 5,059 residents using groundwater.
Lead levels were measured at 7.0 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 710 violations on record, including 171 health-based violations. 52 remain unresolved.
Piedmont ranks #136 out of 137 cities in South Dakota for water quality, placing it among the lowest-rated in the state. Piedmont relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff. While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection. The system has seen 13 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Piedmont's water
Every contaminant flagged in Piedmont, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 7.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 4.00 | 1.3 | mg/L | Inorganic | Over Limit |
Cities ranked by 90th-percentile lead PF PFAS in South Dakota
Cities ranked by compounds detected Cu Copper in South Dakota
Cities ranked by 90th-percentile copper
03Piedmont's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 710 violations on record, including 171 health-based violations. 52 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▲ Up 5 ppb since 1993. Latest reading: 9 ppb (2025) — 60% of the action level. Sampled at higher-risk homes (90th percentile).
4mg/L(2008)
One sampling round on record — 308% of the 1.3mg/L EPA action level. Sampled at higher-risk homes (90th percentile).
04Where Piedmont's water comes from
Piedmont's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
27 systems
27 water systems, operated under local government ownership.
5,059 people
Residents served across Piedmont's service area.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals. Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds. The system is operated by local government ownership and serves approximately 5,059 people through 27 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| NORTHDALE SANITARY DISTRICT | SD4600514 | 1,075 | Groundwater |
| PIEDMONT | SD4602303 | 971 | Purchased Groundwater |
| WESTON HEIGHTS HOMEOWNERS ASSOCIATIO | SD4600862 | 412 | Groundwater |
| BLUCKSBERG MOUNTAIN #2 | SD4602366 | 333 | Groundwater |
| SUNSET RANCH | SD4602263 | 263 | Groundwater |
| VALLEY VIEW WATER COMPANY | SD4600040 | 248 | Groundwater |
| SUNNYSIDE MOBILE HOME PARK II | SD4602001 | 235 | Groundwater |
| BLUCKSBERG MOUNTAIN #1 | SD4600324 | 223 | Groundwater |
| HORSESHOE ACRES WATER ASSOCIATION | SD4602266 | 180 | Groundwater |
| TIMBERWOOD PARK ESTATES | SD4602272 | 158 | Groundwater |
| WESTBERRY TRAILS WATER USERS ASSOC | SD4600253 | 155 | Groundwater |
| ROLLING DICE SUBDIVISION | SD4602249 | 122 | Groundwater |
| ELK CREEK VILLAGE | SD4602237 | 110 | Groundwater |
| SPRING CANYON WATER COMPANY | SD4600015 | 89 | Groundwater |
| SHERIDAN LAKE HIGHLANDS, INC. | SD4602285 | 85 | Groundwater |
| BESTGEN ADDITION WATER COMPANY | SD4600387 | 73 | Groundwater |
| RIMROCK HIGHLAND ESTATES COMM ASSOC | SD4602231 | 66 | Groundwater |
| CROOKED OAKS CANYON HOMEOWNERS | SD4600915 | 65 | Groundwater |
| AUTUMN MEADOWS SANITARY DISTRICT | SD4602240 | 49 | Groundwater |
| PLEASANT VALLEY HOMEOWNERS ASSOCIATI | SD4602172 | 48 | Groundwater |
| CAVALRY TRAILS HOMEOWNER ASSOCIATION | SD4602106 | 44 | Groundwater |
| PINE CONE ESTATES | SD4602179 | 42 | Groundwater |
| VALLEY VIEW WATER ASSOCIATION | SD4602343 | 42 | Groundwater |
| CEDAR GULCH 2 | SD4602295 | 40 | Groundwater |
| LOFTY PINES II | SD4602250 | 38 | Groundwater |
| BRIDLE RIDGE ESTATES | SD4602362 | 38 | Groundwater |
| GOLDEN HILLS SUBDIVISION | SD4602284 | 30 | Groundwater |
Water bodies near Piedmont
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Piedmont's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
1 facility within 10 miles reported 0 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
7 federal disaster declarations on record for Meade County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
Pennington County is in D3 (extreme drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How Piedmont compares
Scores for nearby South Dakota cities on one line, with the average marked.
dashed line = South Dakota average (66/100)
Piedmont scores 39.5/100 — below the South Dakota average of 66/100. It outscores 1 of 10 nearby cities. Full South Dakota rankings →
58.2 / 100FRapid City, SD
38.7 / 100FAberdeen, SD
41.8 / 100AWatertown, SD
91 / 100FPine Ridge, SD
43.2 / 100DBrookings, SD
46.2 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Piedmont's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Lead detected at 7.0 ppb
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Piedmont alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Piedmont, SD tap water safe to drink?
Piedmont's water quality earned a grade of F (39.5/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #136 out of 137 cities tested in South Dakota.
What contaminants are in Piedmont's water?
Lead was measured at 7.0 ppb (90th percentile). 710 violations are on record.
How is Piedmont's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Piedmont?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Piedmont's water come from?
Piedmont's water is sourced from Groundwater. The city has 27 water systems serving approximately 5,059 residents.
What health violations has Piedmont's water system had?
Piedmont has 171 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 52 violations remain unresolved.
Is Piedmont's groundwater at risk of contamination?
Piedmont uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 710 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Piedmont's water compare to other cities?
Piedmont ranks #136 out of 137 cities in South Dakota (better than 1% of state cities) and #14907 out of 15382 cities nationally (3th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.