Grouse Point Water Company LLC water quality
Met every federal limit. 3 contaminants at half a limit or higher. hardness not in the latest CCR.
ID4010232. Data through 2026-04-16. DEQ record.
What's in it
Arsenic
ElevatedAquasana OptimH2O Reverse Osmosis + Claryum is certified to reduce it.
Nitrate (as N)
ElevatedEPA: infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die.
Aquasana OptimH2O Reverse Osmosis + Claryum is certified to reduce it.
Radium 226 + 228
ElevatedAquasana OptimH2O Reverse Osmosis + Claryum: manufacturer-reported, not certified.
5 other contaminants tested, not detected or well below the limit
Copper 0.08ppm Fluoride 0.26ppm HFPO-DA (GenX) ND Lead 1.0ppb PFHxS ND
Filters that match
Aquasana OptimH2O Reverse Osmosis + Claryum
under sink ro · diy
- Arsenicremoves it, NSF or WQA certified
- Nitrate (as N)removes it, NSF or WQA certified
- Radium 226 + 228removes it, per manufacturer testing
Nothing in this water calls for whole-house treatment. A drinking-water filter covers the exposure that matters. Whole-house units here are optional, mainly for taste and chlorine.
Detections ranked by share of the limitevery Tier 1 detection, highest first
Bar length is the highest result in the last 36 months as a share of the federal limit (MCL, or action level for lead and copper). The dark tick marks the limit. Gross alpha is compared after subtracting uranium, as DEQ does for compliance.
Full contaminants reporthighest, latest, limit, trend, last sample
| Contaminant | Highest, 36 mo | Federal limit | Share of limit | Status | Trend | Last sample |
|---|---|---|---|---|---|---|
| Arsenic | 6.6ppb | 10.0ppb MCL | Elevated | 2023-12-29 | ||
| Copper 90th percentile at home taps note | 0.08ppm | 1.30ppm AL | Detected | 2024-12-31 | ||
| Fluoride | 0.26ppm | 4.00ppm MCL | Detected | 2025-12-04 | ||
| HFPO-DA (GenX) | ND | 10.0ppt MCL | Not detected | 2026-04-16 | ||
| Lead 90th percentile at home taps note | 1.0ppb | 15.0ppb AL | Detected | 2024-12-31 | ||
| Nitrate (as N) | 5.70ppm latest ND | 10.00ppm MCL | Elevated | 2025-12-04 | ||
| PFHxS | ND | 10.0ppt MCL | Not detected | 2026-04-16 | ||
| Radium 226 + 228 | 2.61pCi/L | 5.00pCi/L MCL | Elevated | 2025-12-04 |
- Copper: 90th percentile of samples taken at customer taps. Results depend on the home's plumbing.
- Lead: 90th percentile of samples taken at customer taps. Results depend on the home's plumbing.
ppb = parts per billion (µg/L), ppm = parts per million (mg/L), ppt = parts per trillion. ND = not detected above the lab's reporting limit. MCL = federal maximum contaminant level; AL = action level for lead and copper (90th percentile of home taps); aesthetic = secondary standard for taste, odor or staining, not health. Bars show the highest result in 36 months as a share of the limit.
14 other regulated contaminants tested
| Contaminant | 36 mo max | Limit | Status | Last sample |
|---|---|---|---|---|
| Antimony | ND | 6.0ppb | Not detected | 2025-12-04 |
| Atrazine | ND | 3.0ppb | Not detected | 2025-12-04 |
| Barium | 0.10ppm | 2.00ppm | Detected | 2025-12-04 |
| Benzene | ND | 5.0ppb | Not detected | 2025-12-04 |
| Beryllium | ND | 4.0ppb | Not detected | 2025-12-04 |
| Cadmium | ND | 5.0ppb | Not detected | 2025-12-04 |
| Chromium (total) | ND | 0.10ppm | Not detected | 2025-12-04 |
| 1,2-Dibromo-3-chloropropane | ND | 0.2ppb | Not detected | 2025-12-04 |
| Mercury (inorganic) | ND | 2.0ppb | Not detected | 2025-12-04 |
| Tetrachloroethylene | ND | 5.0ppb | Not detected | 2025-12-04 |
| Selenium | ND | 50.0ppb | Not detected | 2025-12-04 |
| Sodium | 79.30ppm | none | Detected | 2025-12-04 |
| Trichloroethylene | ND | 5.0ppb | Not detected | 2025-12-04 |
| Thallium | ND | 2.0ppb | Not detected | 2025-12-04 |
Hardness
Hardness is not reported in the latest CCR. Hardness not reported for this system; softener sizing uses a regional default of 11.7 gpg until a CCR value is reviewed.
Track record1 violations on record, 0 health-based
✓ no violation recorded n monitoring or reporting only n includes a health-based violation ? outside the loaded record
No health-based violations (MCL, treatment technique, or disinfectant level) in the last ten years.
Monitoring and reporting violations (1)
A required sample or report was late or missing. These do not mean a contaminant was found, but a system that skips monitoring has gaps in its record.
| Year | Rule | Count | Detail |
|---|---|---|---|
| 2020 | Nitrates | 1 | Routine monitoring, major · Nitrate (as N) |
Lead and copper at the tap90th percentile of sampled homes against the action level
90th percentile of samples taken at customer taps. Results depend on the home's plumbing. Results are from sampled homes in this system, not from your tap. Home plumbing can add lead and copper. First-draw samples run higher than flushed ones.
90th percentile of samples taken at customer taps. Results depend on the home's plumbing. Results are from sampled homes in this system, not from your tap. Home plumbing can add lead and copper. First-draw samples run higher than flushed ones.
Where the water comes from3 active wells
3 active wells, and 1 treatment point on record (SDWIS counts each chlorination or filtration point as a treatment plant).
WELL #3: Susceptibility: ioc moderate, voc moderate, soc moderate, microbial moderate.
Source water assessment susceptibility: final map[IOC:Moderate Microbials:Moderate SOC:Moderate VOC:Moderate]; hydrologic sensitivity H; pci land use map[IOC:M Microbials:M SOC:M VOC:M]; system construction L;
Source names (3)
WELL #1 EMERGENCY, WELL #2 EMERGENCY, WELL #3
Every match, by categorytop three per category
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Drinking water
Under sink, pitcher, or faucet. Treats the water you drink and cook with.
Aquasana OptimH2O Reverse Osmosis + Claryum
Certified for arsenic, nitrate, and fluoride (NSF/ANSI 58, pentavalent); manufacturer-reported for radium 226 + 228.
Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution.
Brondell Circle RC100 Reverse Osmosis System
Certified for arsenic, radium 226 + 228, and fluoride (NSF/ANSI 58, pentavalent). Does not address nitrate.
Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution.
APEC ROES-50 Essence 5-Stage Reverse Osmosis
Manufacturer-reported reduction for arsenic, nitrate, and radium 226 + 228. Not NSF-certified for arsenic, nitrate, and radium 226 + 228.
Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution.
Whole house
Installed where water enters the house. For fixtures, laundry and showers.
Nothing in this water calls for whole-house treatment. A drinking-water filter covers the exposure that matters. Whole-house units here are optional, mainly for taste and chlorine.
Crystal Quest Ultimate Whole House Arsenic Removal Filter (Triple Cartridge, 4-6 GPM)
Manufacturer-reported reduction for arsenic. Does not address nitrate and radium 226 + 228.
Plumber recommended if you are not comfortable with this install.
Express Water WH300SCKS 3-Stage Heavy Metal Whole House Filter (Sediment, KDF, Carbon)
Manufacturer-reported reduction for lead. Does not address arsenic, nitrate, and radium 226 + 228.
Plumber recommended if you are not comfortable with this install.
Sprite High Output 2 Universal Shower Filter with 3-Setting Shower Head (HO2-WH-M)
Does not address arsenic, nitrate, and radium 226 + 228.
DIY. No plumbing.
Softener or conditioner
Worth it at 7 grains per gallon or more.
Whirlpool WHES40E 40,000 Grain Water Softener
Certified for radium 226 + 228 and barium (NSF/ANSI 44). Does not address arsenic and nitrate.
DIY if you are comfortable with this install.
Aquasure Serene Lite 650K Salt-Free Water Conditioner with Triple Purpose Pre-Filter
Does not address arsenic, nitrate, and radium 226 + 228.
Plumber recommended if you are not comfortable with this install.
Whirlpool WHES30E 30,000 Grain Water Softener
Does not address arsenic, nitrate, and radium 226 + 228.
DIY if you are comfortable with this install.
Questions about Grouse Point Water Company LLC
Is Grouse Point Water Company LLC tap water safe to drink?
Grouse Point Water Company LLC met every federal limit in the last 36 months, with no open health-based violation. 3 contaminants were at half the limit or higher: Arsenic, Nitrate (as N) and Radium 226 + 228. The results table shows each value against its limit. Results reflect the system's sampling points, not the plumbing in any one home.
Is Grouse Point Water Company LLC water hard?
Hardness has not been reported for Grouse Point Water Company LLC in a reviewed Consumer Confidence Report yet. The softener sizing widget uses a labelled county default until a report is reviewed.
Is Grouse Point Water Company LLC water fluoridated?
Fluoride was measured at up to 0.26 mg/L, below the 0.7 mg/L level used for community fluoridation, so it is naturally occurring rather than added. The federal limit (MCL) is 4 mg/L.
Where does Grouse Point Water Company LLC water come from?
Grouse Point Water Company LLC draws from 3 active wells with 1 treatment plant on record. Source and treatment details are listed above.
What filter fits Grouse Point Water Company LLC water?
For drinking water the matching engine ranks Aquasana OptimH2O Reverse Osmosis + Claryum first for this profile, based on certified reduction claims for the contaminants flagged above. See the filters section for the reasoning and alternatives.
Who to call
- System contact: WANNER, LISA, 208-761-5366
- DEQ Boise Regional Office, 1445 N Orchard St, Boise ID 83706, (208) 373-0550
- Central District Health (well testing, septic, local health questions)
Sources
Sample results as of 2026-04-16; inventory and violations from EPA SDWIS; page built 2026-09-14. 41 individual results reviewed.
More: Ada County, Arsenic, Nitrate (as N), Radium 226 + 228
Numbers are the system's samples at its taps and wells, not yours. Lead and copper are 90th percentiles from sampled homes. Well pages are nearby-sample estimates. Health text restates EPA and DEQ. Methodology.