Prosser, WA (99350): 29 Violations Recorded for Mapped Water Systems
EPA data combined for 4 water systems mapped to this ZIP (largest mapped system: City of Prosser)
EPA records for the water systems mapped to 99350 in Prosser, WA contain 29 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 29 violations (non-health) (since 2021).
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 9 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
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The top classification in Prosser (99350) safety data is critical - only one condition reaches that level, with no high-priority findings documented below it.
Score Breakdown
Overall Home Safety Score: Score unavailable
Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.
The score is withheld for this ZIP: a water system serving it has EPA UCMR5 PFAS results above the value of an EPA PFAS MCL (with compliance required from 2029), and the current score input does not include that system. We will show the score again once it is recalculated with that system's PFAS results included.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) HIGH
Your Water System
ZIP code 99350 in Prosser, Washington is mapped to the water system City of Prosser (EPA ID: WA5369750). This system provides water to approximately 12,070 people from groundwater sources.
There are 4 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| City of Prosser | WA5369750 | 12,070 | Groundwater |
| Benton City Water | WA5305800 | 5,626 | Groundwater |
| Whitstran Heights Water Association | WA5396550 | 65 | Groundwater |
| Plymouth Water District | WA5368045 | 288 | Groundwater |
Other Water Quality Reports in Washington
- 98001 (Auburn) - 6 violations recorded for mapped water systems
- 98002 (Auburn) - 2 violations recorded for mapped water systems
- 98003 (Federal Way) - 1 violation recorded for mapped water systems
- 98004 (Bellevue) - 3 violations recorded for mapped water systems
- 98005 (Bellevue)
- 98006 (Bellevue) - 5 violations recorded for mapped water systems
- 98007 (Bellevue)
- 98008 (Bellevue)
- 98009 (Bellevue)
- 98010 (Black Diamond)
- 98011 (Bothell) - 1 violation recorded for mapped water systems
- 98012 (Bothell) - 2 violations recorded for mapped water systems
- 98013 (Burton)
- 98014 (Carnation) - 3 violations recorded for mapped water systems
- 98015 (Bellevue)
- 98019 (Duvall) - 45 violations recorded for mapped water systems
- 98020 (Edmonds) - 3 violations recorded for mapped water systems
- 98021 (Bothell) - 5 violations recorded for mapped water systems
- 98022 (Enumclaw) - 2 violations recorded for mapped water systems
- 98023 (Federal Way) - 1 violation recorded for mapped water systems
Nearby Water Quality Reports
- 98930 (Grandview) - 7 mi - 25 violations recorded for mapped water systems
- 98935 (Mabton) - 12 mi
- 98944 (Sunnyside) - 13 mi - 5 violations recorded for mapped water systems
- 99320 (Benton City) - 14 mi - 24 violations recorded for mapped water systems
- 99345 (Paterson) - 16 mi
- 98938 (Outlook) - 18 mi - 3 violations recorded for mapped water systems
- 99353 (West Richland) - 20 mi - 22 violations recorded for mapped water systems
- 98932 (Granger) - 21 mi - 3 violations recorded for mapped water systems
- 99352 (Richland) - 23 mi - 39 violations recorded for mapped water systems
- 99354 (Richland) - 23 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Prosser (WA5369750) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 99350. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFHxS, PFOS, PFHxA, PFPeA, PFPeS, PFBS.
Highest measured level: 0.0143 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Health Risks from Detected Contaminants
Fluoride
Moderate RiskEPA reference value: 4 mg/L (estándar secundario: 2.0 mg/L)
Tooth & bone damage at high levels
At-risk groups: children aged 8 and younger during tooth development
Treatment options (verify a product is certified to reduce this contaminant): reverse osmosis, activated alumina, distillation · Find a filter →
Environmental Hazards (11) MODERATE
Home & Infrastructure (7) OK
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Prosser
Based on local data for ZIP 99350, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in Prosser has 9 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Gutter Installation & Repair
The median home in 99350 was built around 1986. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 99350 safe to drink?
EPA SDWIS records 29 violations since 2021 across the water systems mapped to ZIP 99350 (primary system: City of Prosser), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 99350's water come from?
The recorded water source for City of Prosser, a system mapped to ZIP code 99350, is Groundwater. This system serves approximately 12,070 people.
How can I get my water tested in Prosser?
If City of Prosser supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
What is the radon risk for 99350?
99350 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Benton County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 99350's water?
Yes, PFAS have been detected in samples from water systems mapped to 99350. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
What does the NFIP claim history show for ZIP 99350?
FEMA records contain 9 flood insurance claims filed in ZIP code 99350; the recorded rated-zone value (the most frequent one if there are several claims) is A10, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). Prosser, WA (99350): 29 Violations Recorded for Mapped Water Systems. https://zipcheckup.com/report/99350/
@misc{zipcheckup-report-99350,
author = {{ZipCheckup}},
title = {{Prosser, WA (99350): 29 Violations Recorded for Mapped Water Systems}},
year = {2026},
url = {https://zipcheckup.com/report/99350/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 99350
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 98930 | Grandview, WA | 7.2 mi | B | 25 |
| 98935 | Mabton, WA | 11.7 mi | N/A | 0 |
| 98944 | Sunnyside, WA | 13.4 mi | B | 5 |
| 99320 | Benton City, WA | 13.9 mi | C | 24 |
| 99345 | Paterson, WA | 16.1 mi | N/A | 0 |
| 98938 | Outlook, WA | 17.9 mi | N/A | 3 |
| 99353 | West Richland, WA | 20.1 mi | B | 22 |
| 98932 | Granger, WA | 21.4 mi | B | 3 |
| 99352 | Richland, WA | 23.2 mi | C | 39 |
| 99354 | Richland, WA | 23.3 mi | C | 0 |
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