Hardness
Unavailable
No qualifying site within 75 miles
Local water dashboard
Official source aggregationWater quality in Chalkyitsik, AK 99788
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Yukon-Koyukuk Census Area.
3 reported benchmark flags
- Primary matched system
- Chalkyitsik Village Water
- Source water
- Surface water
- County
- Yukon-Koyukuk Census Area
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.0055 mg/L
37% of action level
Utility match
1 system
Serves 76 people system-wide
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 75 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass3 fail
Lead (PB90)
0.0055 mg/L
Reported Dec 31, 2025
Copper (CU90)
1.35 mg/L
Reported Dec 31, 2020
Numerical coverage
4 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0055
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.35
EPA limit 1.3
Total Haloacetic Acids (HAA5)
Measured in MG/L
Local 0.136
EPA limit 0.06
TTHM
Measured in MG/L
Local 0.122
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 182
- Health-based
- 31
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | AK2300183 | Unaddressed | Jan 9, 2026 |
| Surface Water Treatment RuleHealth-based | AK2300183 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Resolved | Sep 1, 2025through Sep 30, 2025 |
| Surface Water Treatment Rule | AK2300183 | Resolved | Sep 1, 2025through Sep 30, 2025 |
| Revised Total Coliform Rule | AK2300183 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Chlorine | AK2300183 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Surface Water Treatment Rule | AK2300183 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Chlorine | AK2300183 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Surface Water Treatment Rule | AK2300183 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Revised Total Coliform Rule | AK2300183 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Lead and Copper Rule | AK2300183 | Resolved | Jul 1, 2025through Sep 23, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Surface Water Treatment RuleHealth-based | AK2300183 | Resolved | Jun 1, 2025through Jun 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Resolved | May 1, 2025through May 31, 2025 |
| Surface Water Treatment RuleHealth-based | AK2300183 | Resolved | May 1, 2025through May 31, 2025 |
| Surface Water Treatment Rule | AK2300183 | Resolved | May 1, 2025through May 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AK2300183 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Surface Water Treatment Rule | AK2300183 | Resolved | Apr 1, 2025through Apr 30, 2025 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Chalkyitsik ZIP 99788 using available compliance data and 4 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), Total Haloacetic Acids (HAA5), TTHM have a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Chalkyitsik
Is tap water safe in Chalkyitsik?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
There are not enough qualifying nearby USGS observations for a responsible hardness estimate. Ask the serving utility or test the household tap.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.